Modify interface recovery to support multi-asic (#5087)

What is the motivation for this PR?
Modify config interface command to take namespace parameter.
When running any test case with Sanity tests, if the testbed is in bad state and recovery operation is done, then it results in the error missing  -n namespace option.

How did you do it?
Modified interface recovery to startup interface in a specific asic namespace.

How did you verify/test it?
Bring up single and multi-asic vs testbeds.
Put the DUT in bad state by shutting any of the up interface.
Run the basic bgp facts test on single and mult-asic VS testbed, where one interface is down.

tests/common/plugins/sanity_check/recover.py

@@ -39,7 +39,8 @@ def __recover_interfaces(dut, fanouthosts, result, wait_time):
         fanout, fanout_port = fanout_switch_port_lookup(fanouthosts, dut.hostname, port)
         if fanout and fanout_port:
             fanout.no_shutdown(fanout_port)
-        dut.no_shutdown(port)
+        asic = dut.get_port_asic_instance(port)
+        dut.asic_instance(asic.asic_index).startup_interface(port)
     wait(wait_time, msg="Wait {} seconds for interface(s) to restore.".format(wait_time))
     return action