Default Tunnels deleted from config

Default Tunnels deleted from config

When configuring integration bridge, we copy
bridge parameters from operational to configuration
to avoid overwriting them. If any tunnel ports were
added to config before we copyBridgeConfig, they
get overwritten and are lost.

Fix is to use a merge instead of put when copying
bridge to config. This operation is done only
during initial bringup, so overhead of using
merge is acceptable.

JIRA: NETVIRT-1541

Change-Id: I003032883ebae5e405b4d7b849fb2043179f63ff
Signed-off-by: Vishal Thapar <vthapar@redhat.com>