Update swagger spec validation library
Update swagger spec validation library

Updates the validation library to swagger-tools[1], which seems better-
supported.  Removes the check from the main "test" script since neither
this nor any other tool allows skipping specific rules, and we'll be going
back to non-spec-compliant parameter definitions in the patch to follow.

Maybe todo someday: Fork this and update to allow non-required path
parameters.

Change-Id: Ic888112e7767928350adc643f304d0cf5a313cee

wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps,wikimedia/mediawiki-services-mobileapps