Implement "restart" for RemoteDB services

[evgeni]

It's not really a restart, as we can't control it, but it checks the DB
and returns the status properly.

Fixes: 7cdffe7

[evgeni]

before:

# foreman-maintain service restart --only postgresql
Running Restart Services
================================================================================
Check if command is run as root user:                                 [OK]
--------------------------------------------------------------------------------
Restart applicable services: 

Restarting the following service(s):
postgresql (candlepin), postgresql (foreman), postgresql (pulpcore)
- restarting postgresql (pulpcore)#<Thread:0x000055b14795a210 /usr/share/gems/gems/foreman_maintain-1.7.1/definitions/features/service.rb:94 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
/usr/share/gems/gems/foreman_maintain-1.7.1/definitions/features/service.rb:94:in `block (2 levels) in fork_threads_for_services': undefined method `restart' for RemoteDB(postgresql:candlepin [10]):ForemanMaintain::Utils::Service::RemoteDB (NoMethodError)
Did you mean?  start
#<Thread:0x000055b147959d88 /usr/share/gems/gems/foreman_maintain-1.7.1/definitions/features/service.rb:94 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
/usr/share/gems/gems/foreman_maintain-1.7.1/definitions/features/service.rb:94:in `block (2 levels) in fork_threads_for_services': undefined method `restart' for RemoteDB(postgresql:foreman [10]):ForemanMaintain::Utils::Service::RemoteDB (NoMethodError)
Did you mean?  start
#<Thread:0x000055b147959928 /usr/share/gems/gems/foreman_maintain-1.7.1/definitions/features/service.rb:94 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
/usr/share/gems/gems/foreman_maintain-1.7.1/definitions/features/service.rb:94:in `block (2 levels) in fork_threads_for_services': undefined method `restart' for RemoteDB(postgresql:pulpcore [10]):ForemanMaintain::Utils::Service::RemoteDB (NoMethodError)
Did you mean?  start
                                    [FAIL]
undefined method `restart' for RemoteDB(postgresql:candlepin [10]):ForemanMaintain::Utils::Service::RemoteDB
Did you mean?  start
--------------------------------------------------------------------------------
Scenario [Restart Services] failed.

The following steps ended up in failing state:

  [service-restart]

Resolve the failed steps and rerun the command.

If the situation persists and, you are unclear what to do next,
contact Red Hat Technical Support.

In case the failures are false positives, use
--whitelist="service-restart"

after

# foreman-maintain service restart --only postgresql
Running Restart Services
================================================================================
Check if command is run as root user:                                 [OK]
--------------------------------------------------------------------------------
Restart applicable services: 

Restarting the following service(s):
postgresql (candlepin), postgresql (foreman), postgresql (pulpcore)
\ restarting postgresql (pulpcore)                                              
postgresql (candlepin) is remote and is UP. It can't be restarted

postgresql (foreman) is remote and is UP. It can't be restarted

postgresql (pulpcore) is remote and is UP. It can't be restarted
\ All services restarted                                              [OK]      
--------------------------------------------------------------------------------

[ehelms]

This is ambiguous, and I am trying to think through better wording:

• Must be restarted manually
• Cannot be restarted by #{tool-name}
• Remote databases are not managed by #{tool-name}, they must be restarted by you.

[evgeni]

Maybe. But it's in line with enable/disable in this file, and @lpramuk pointed out that having some kind of MSG for start/stop would also be cool.

Further improvement?

[ehelms]

Be more explicit is my ask, how about:

Remote databases are not managed by #{tool-name} and therefore was not restarted.