Replace the usage of 'manager' with 'os_primary'

In tempest, alias 'manager' has been moved to 'os_primary'
in version Pike, and it will be removed in version Queens.
This patch is to replace the usage of 'manager' with 'os_primary'.

For other details, please check:
https://review.openstack.org/#/c/457555/

Change-Id: I7c3740d8941b837767d576d4e9b1fb86cd164d59
1 file changed
tree: 6ec8dc1e884936229d8e8f2178feb62167bcd9ad
  1. manila_tempest_tests/