[vstest]: remove kill exabgp command from the test (sonic-net#4978)

the command kills all exabgp processes on the host.
since the namespaces are newly added, there should
be no prior exabgp processes.

if it is existing namespace, it is also the dvs
framework job to clean up all prior processes.

platform/vs/tests/bgp/test_gr_livelock.py

@@ -81,7 +81,6 @@ def test_gr_livelock(dvs, testlog):
     dvs.servers[0].runcmd("pip install 'exabgp==4.0.10' --force-reinstall ")
     #
     dvs.copy_file("/etc/frr/", "bgp/files/gr_livelock/bgpd.conf")
-    dvs.servers[0].runcmd("pkill exabgp") # In case previous test didn't stop exa
     dvs.runcmd("supervisorctl stop bgpd")
     time.sleep(5)
     dvs.runcmd("supervisorctl start bgpd")

platform/vs/tests/bgp/test_no_export.py

@@ -5,10 +5,9 @@
 import json
 
 def test_bounce(dvs, testlog):
-    dvs.servers[0].runcmd("pkill -f exabgp")
     dvs.copy_file("/etc/frr/", "bgp/files/no_export/bgpd.conf")
     dvs.runcmd("supervisorctl start bgpd")
-    dvs.runcmd("ip addr add 10.0.0.0/31 dev Ethernet0") 
+    dvs.runcmd("ip addr add 10.0.0.0/31 dev Ethernet0")
     dvs.runcmd("config interface startup Ethernet0")
 
     dvs.runcmd("ip addr add 10.0.0.2/31 dev Ethernet4")
@@ -30,7 +29,7 @@ def test_bounce(dvs, testlog):
     (exit_code, sum_res) =  dvs.runcmd(["vtysh", "-c", "show ip bgp sum"])
     (exit_code, all_route) = dvs.runcmd(["vtysh", "-c", "show ip bgp"])
     (exit_code, announce_route) = dvs.runcmd(["vtysh", "-c", "show ip bgp neighbors 10.0.0.3 advertised-routes"])
- 
+
     p1.terminate()
     p1 = p1.wait()