Replace the usage of 'manager' with 'os_primary'

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'.

Change-Id: I5301287b3c6265a6f235d63b3665199065bde0d4
3 files changed