Update LinkCache::addGoodLinkObj param defaults to int

Update the defaults for $revision and $model from bool to int, making it
consistent with the documented input. Also update docs and line length.
Change "inval( $x )" to preferred "(int) $x" while changing the method.

Change-Id: Ic19a408aa7c50fb03e2c3aca8df3fa7cedc2420b