[static route] Ignore BGP summary failure

What is the motivation for this PR?
The command show ip bgp summary may fail if there are no BGP sessions up. Since static route feature has no dependency on BGP, the test cases should continue even if the command fails.

How did you do it?
Ignore failure on show ip bgp summary command.

Author: shi-su

tests/route/test_static_route.py

@@ -125,7 +125,7 @@ def check_route_redistribution(duthost, prefix, ipv6, removed=False):
         SHOW_BGP_SUMMARY_CMD = "show ip bgp summary"
         SHOW_BGP_ADV_ROUTES_CMD_TEMPLATE = "show ip bgp neighbor {} advertised-routes"
 
-    bgp_summary = duthost.shell(SHOW_BGP_SUMMARY_CMD)["stdout"].split("\n")
+    bgp_summary = duthost.shell(SHOW_BGP_SUMMARY_CMD, module_ignore_errors=True)["stdout"].split("\n")
 
     bgp_neighbors = []