Fix logic in bash inside installContrailCompute method

Existing logic leads to unconditional reboot of cmp nodes
inside installContrailCompute method.
If vhost0 interface is already present, cmp node shouldn't be rebooted.

Change-Id: I1a43c3a1d95b81f55aec345ab8f173df9482ef2a
Related-PROD: PROD-25554
1 file changed