Bug 28377: (follow-up) Remove svc/hold/{resume|suspend}

Bug 28377: (follow-up) Remove svc/hold/{resume|suspend}

This files are no longer used and thus removed. Their functionality is
already present on the API

POST   /holds/:hold_id/suspension
DELETE /holds/:hold_id/suspension

To test:
1. Apply this patch
2. Run:
   $ git grep 'hold/suspend'
   $ git grep 'hold/resume'
=> SUCCESS: No references to the scripts
3. Sign off :-D

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>