Properly apply column default in migration pool_monitor_status

server_default parameter should be used to apply default value at
table/column creation time. Otherwise non-nullable column can't
be created because of existing rows in the tables.

Change-Id: I7136e6a0dfb9dc66ca63ff3c9fcf6de164e27e63
Closes-Bug: #1305725
Merge "Properly apply column default in migration pool_monitor_status"