The DeprecationWarning warnings were intended to inform that the old

djblets.webapi.auth and djblets.webapi.resources modules are

deprecated and all functionality is stored in submodules. However,

these messages are always printed, even though the imports are updated.

This patch removes these deprecation warnings as they will always be

printed and are not helpful.
This patch also fixes one import that was not updated.

No deprecation warnings are printed with this patch applied.