[swss] Adding bgp container as dependent of swss (sonic-net#11000)

What I did:
Added bgp as a dependent of swss

Why I did it:
bgp container was not restarting on swss crash. When swss crashes, linkmgrd
doesn't initate a switchover because it cannot access the default route from
orchagent. Bringing down bgp with swss will isolate the ToR, causing linkmgrd
to initiate a switchover to the peer ToR avoiding significant packet loss.

How I did it:
Added bgp to DEPENDENT

Signed-off-by: Nikola Dancejic <ndancejic@microsoft.com>

files/scripts/swss.sh

@@ -9,7 +9,7 @@ LOCKFILE="/tmp/swss-syncd-lock$DEV"
 NAMESPACE_PREFIX="asic"
 ETC_SONIC_PATH="/etc/sonic/"
 
-DEPENDENT="radv"
+DEPENDENT="radv bgp"
 MULTI_INST_DEPENDENT="teamd"
 
 . /usr/local/bin/asic_status.sh