neutron option --ha should not be case sensitive

[Andre Naehring]

Creating a router with neutron on cli, I am forced to use "True" for ha option. This should not be case sensitive:

oslatest:~ # neutron router-create --ha true externalRouter
usage: neutron router-create [-h] [-f {shell,table,value}] [-c COLUMN]
                             [--max-width <integer>] [--prefix PREFIX]
                             [--request-format {json,xml}]
                             [--tenant-id TENANT_ID] [--admin-state-down]
                             [--distributed {True,False}] [--ha {True,False}]
                             NAME
neutron router-create: error: argument --ha: invalid choice: u'true' (choose from 'True', 'False')

oslatest:~ # neutron router-create --ha True externalRouter
Not enough l3 agents available to ensure HA. Minimum required 2, available 1.

[Armando Migliaccio (armando-migliaccio)]

Not strictly duplicated by #1368934 but the issue is largely the same.

[Armando Migliaccio (armando-migliaccio)]

This is the proposed fix:

https://review.openstack.org/#/c/121219/

[Armando Migliaccio (armando-migliaccio)]

The fix above addressed the case sensitive problems for the HA attribute too.