[submodule]: update sonic-swss-common/sonic-sairedis/sonic-swss

[qiluo-msft]

Commits in sonic-swss-common:

2b9a00f 2020-09-16 | Move RedisClient functions into DBConnector (#382) (HEAD -> master, origin/master, origin/HEAD) [Qi Luo]
7db299a 2020-09-12 | Throw out_of_range exceptions with meaningful message for multi-DB and multi-namespace (#381) [Qi Luo]

Commits in sonic-sairedis:

6117cf5 2020-09-17 | Replace RedisClient with DBConnector (#660) (HEAD -> master, origin/master, origin/HEAD) [Qi Luo]
3026945 2020-09-07 | Add Break Before Make mechanism to syncd comparison logic (#642) [Kamil Cudnik]
caa7ab2 2020-09-02 | Fix Warmboot Issue when upgraded Image SAI return Switch Internal OID not accounted in previous image. (#654) [abdosi]
9c80626 2020-08-31 | Prevent syncd from stopping swss in the presence of SAI failures in synchronous mode (#653) [shi-su]

Commits in sonic-swss:

b4938a5 2020-09-18 | Replace RedisClient with DBConnector (#1439) (HEAD -> master, origin/master, origin/HEAD) [Qi Luo]
5b0f7be 2020-09-16 | [dvs] Update test_nhg.py to make it pass in synchronous mode (#1438) [shi-su]
f041c84 2020-09-15 | [teamsyncd]: Fix LAG add: write MTU configuration. (#1437) [Nazarii Hnydyn]
7b15a65 2020-09-16 | Fix #3971 by skipping create-only SAI attributes when modifying buffer pools or profiles in orchagent (#1430) [Stephen Sun]
30b51db 2020-09-13 | [dvs] Re-enable DPB VS tests (#1426) [Danny Allen]
c38abc2 2020-09-10 | [orch] Fix the logic of judging malformed reference (#1415) [Teng Fei]
842f126 2020-09-08 | [dvs] Refactor acl_ctrl and acl_egress to use dvslib (#1416) [Danny Allen]

- Why I did it

- How I did it

- How to verify it

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

• 201811
• 201911
• 202006

- Description for the changelog

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