This command should be used by operators and deployment tools to
determine whether full neutron-server shutdown is needed for database
upgrade.
The change also makes neutron-db-manage tool to return the cumulative
result of commands being issued (in most cases it will still be 0 only,
since our command handlers implicitly return None).
DocImpact: Update doc to add new command 'has_offline_migrations' to
'neutron-db-manage' tool. The command determines whether full
neutron-server shutdown is needed for database upgrade.
Closes-Bug: #1519118
Change-Id: I7c5a4882ad4f80459ebe69c9a9c43cc60ce50200
Co-Authored-By: Martin Hickey <martin.hickey@ie.ibm.com>
Ihar Hrachyshka