Bug 4880: Make koha-remove stop all instance's services

Bug 4880: Make koha-remove stop all instance's services

This patch makes koha-remove stop all instance's services before
attempting to remove the system user,

Before this patch, only zebra was stopped.

To test:
- Run:
  $ sudo koha-create --created-db favourite_name
- Run:
  $ sudo koha-remove favourite_name
=> FAIL: koha-indexer is still running for user favourite_name-koha
- Run:
  $ sudo koha-create --created-db another_name
  $ sudo koha-plack --enable another_name
  $ sudo koha-plack --start another_name
  $ sudo koha-indexer --stop another_name
  $ sudo koha-remove another_name
=> FAIL: koha-plack is still running for user another_name-koha
- Apply the patch
- Repeat the previous tests, with new names
=> SUCCESS: Everything works as expected :-D
- Sign off :-D

Signed-off-by: Lucio Moraes <lmoraes@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>