Add -w in grep of attach nic
Add -w in grep of attach nic

Resolve ZSTAC-7592

zstackorg/zstack-utility,zstackio/zstack-utility,live4thee/zstack-utility,live4thee/zstack-utility,zstackio/zstack-utility,live4thee/zstack-utility,zstackorg/zstack-utility,zstackio/zstack-utility,zstackorg/zstack-utility