[FRR]: Upgrade FRR to frr-7.5.1-s1 tag

[shi-su]

Why I did it

Update FRR 7.5.1 head. The following is a list of new commits.

c69608a68 Merge pull request #9334 from FRRouting/mergify/bp/stable/7.5/pr-9214
d18f52666 zebra: bugfix of error quit of zebra, due to no nexthop ACTIVE
b4ab71513 Merge pull request #8988 from c-po/frr-7.5-bfdd-backport
b16b16444 Merge pull request #9009 from ton31337/fix/handle_es-evi_7.5
f9c92118c zebra: handle "show evpn es-evi" a non-existent VNI
a10191532 tools: add bfdd to frr-reload.py daemons list
8f96d1590 Merge pull request #8880 from FRRouting/mergify/bp/stable/7.5/pr-8876
f5f4c41c6 Merge pull request #8883 from FRRouting/mergify/bp/stable/7.5/pr-8874
445a72ebf ospfd: fix routemap update
be8c6f817 lib: remove pure attribute from functions that modify memory
ff905c6c3 Merge pull request #8739 from dmbaturin/7.5-8695
312e087a8 Merge pull request #8742 from taspelund/fix_pfx-tree_default_7.5
ed71c114f lib: fix handling of rmap prefix-tree default node
13d2a156e staticd: fix distance processing
e1a73c5ce Merge pull request #8624 from c-po/graceful-restart-7.5
e17192301 bgpd: changing graceful-restart parameters should not be considered as error
fd1e14bff Merge pull request #8579 from opensourcerouting/7.5/fixes-20210421
86965a2c5 lib: correctly exit CLI nodes on file config load
989ae2973 lib: fix possible assert() fail in zlog_fd()
ddab69d59 Merge pull request #8533 from idryzhov/7.5-fix-yang-zebra
7573cb86a yang: fix zebra module
d8d60034a Merge pull request #8512 from f0o/stable/7.5
5f8b6df82 Merge pull request #8518 from idryzhov/7.5-debian-10-ci
f58cfe0f9 tests: fix l3mdev config in isis-topo1-vrf topotest
5655277de tests: fix l3mdev config in bgp_vrf_lite_ipv6_rtadv topotest
fb1c7a5df tests: fix l3mdev config in bgp_l3vpn_to_bgp_vrf topotest
d159e8f60 tests: fix l3mdev config in bgp_evpn_rt5 topotest
169573e5e tests: add l3mdev config helpers for VRF topotests
bff35f0ef tools: run `vtysh -b` once for all-startup
c78aaee76 Merge pull request #8468 from idryzhov/7.5-fix-acl-delete
53bdf529f lib: fix access-list deletion
06a04f2dd Merge pull request #8439 from idryzhov/7.5-fix-interface-nb-stale-pointers
dac4ee8b0 Merge pull request #8454 from idryzhov/7.5-fix-dup-acl
8a94d77db lib: fix check for duplicated access-list entries
9d7ab918a lib: fix interface nb stale pointers
b583f882e Merge pull request #8418 from mjstapp/fix_nhrp_bgp_sa_7_5
e4febb445 Merge pull request #8416 from mjstapp/fix_nh_labels_cmp_7_5
1ca60ce86 bgpd, nhrpd: fix clang static analysis warnings in 7.5 branch
f33049c2c lib: Fix label-stack comparison for nexthops
746d47437 Merge pull request #8390 from c-po/backports
d40a648a7 Merge pull request #8393 from idryzhov/7.5-ospf-ignore-dup
e6b5643b8 Merge pull request #8371 from idryzhov/7.5-filter-fixes
3889b7a5d ospfd: ignore duplicated "ip ospf area" commands
3d506af6a Merge pull request #8359 from idryzhov/7.5-fix-nb-vrf-crash
9b6f57f1c tools: frr-reload fixes for deleting vrf static routes
e1062f87c Merge pull request #8386 from idryzhov/7.5-fix-no-bfd
0836db472 bfdd: fix profiles autocompletion
011f789ef bbfd: clear nb config entries when removing bfd node
4b793d1eb bfdd: remove profiles when removing bfd node
9290f3c3b lib: fix checking for duplicated prefix-list entries
c3e80e823 lib: fix checking for duplicated access-list entries
242f2f5a2 Merge pull request #8363 from idryzhov/7.5-fix-ospf-cli-count
6e55a5a94 ospfd: fix counting of "ip ospf area" commands
1ce35e3b5 *: modify VRF_CONFIGURED flag only in VRF NB layer
18f209926 Merge pull request #8328 from idryzhov/7.5-backports-2021-03-24
526a69317 zebra: fix duplicated definitions
543e6a5e9 zebra: fix vni configuration in default vrf
99d38de06 ospf6d: fix warning message when interfae disabled
277b2fccf ospf6d: remove interface prefix when area is removed
56215e6de ospf6d: fix iface commands lost when removing from area
edd3a0695 lib: fix a crash in plist update
0fd7924ec bfdd: fix starting echo receive timer
d8479dcdd bgpd: Attempting to activate unicast and labeled-unicast
94d09040c eigrpd: fix dependency on operational state in cli
5b2da949d eigrpd: fix xpaths
a006b1725 bgpd: handle socket read errors in the main pthread
8ceaf2ca5 bfdd: make sessions administratively up by default
a5ecac92c lib: fix crash when iterating over nb operational data
082afd7d3 bfdd: fix detect timeout
a912b1299 Merge pull request #8306 from c-po/isis-backports
52020eabe isisd: fix extra space after "ip router isis"
26b9d47fd ospf6d: fix setting NOAUTOCOST flag
8bfe356db bfdd: fix echo configuration in profile
124efb85c bfdd: session specific command type checks
6eeeec971 bfdd: require local-address when using multihop
5dd47f73c bgpd: fix bgp statistics for l2vpn evpn
0e3928dc9 doc: fix link for python2 get-pip.py
eb14a71d0 lib: print NULL for NULL nexthops
0c592d092 isisd: Fix spelling mistake
60eb6e4c0 isisd: Fix extra space after `router isis FOO`
34326200f Merge pull request #8314 from mjstapp/fix_bgp_td_spec
77b0364ed bgpd: fix format spec in 7.5 branch
301dee3fd Merge pull request #8277 from c-po/backports-7.5
dd4dd1d90 bgpd: If we have a SAFI conflict do not allow labeled unicast to reset
860546103 Merge pull request #8272 from mjstapp/fix_netlink_backport_7_5
0bf1c265a zebra: backport 7.5 netlink cleanups

How I did it

Update FRR 7.5 pointer and create a tag frr-7.5.1-s1.

How to verify it

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106

Description for the changelog

A picture of a cute animal (not mandatory but encouraged)