Import the parameter types from openstacklib::policy so that parameter
types are validated at module level, instead of internal resource
call.
Also remove the tag which is no longer necessary after dependency
refactoring.
Change-Id: I4d66c8753708fc993ff9f6053a367afc65dc9a76
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>