Support custom monit filename

[zocoi]

I'm using monit-5.9 and our server config requires a custom path and extension e.g
/usr/local/etc/monit.d/foobar-worker.monitrc instead of *.conf file. I managed to override the custom folder path but not the file name. Hence this PR exists.

Please help reviewing. It has been manually tested.

set :sidekiq_monit_conf_dir, '/usr/local/etc/monit.d'
set :sidekiq_monit_conf_file, 'service-worker.monitrc'
set :monit_bin, '/usr/local/bin/monit'

[zocoi]

ping @seuros

[seuros]

This don't take in account multiple processes.

you can overwrite the name with :

https://github.com/seuros/capistrano-sidekiq/blob/master/lib/capistrano/tasks/monit.rake#L95-L97

[zocoi]

There's only one config file uploaded to the host, multiple processes are generated from the template right? By default, the helper method def sidekiq_service_name(index=nil) generate the filename without index so it should not matter here.

Also, the new config would take care of different extension, for example I need *.monitrc instead of *.conf for monit-5.9