Be more selective when killing stray Sidekiqs

Avoid the background_jobs script killing every process with 'sidekiq' in
its argument string (e.g. 'rake gitlab:sidekiq start') by also catching
the number (2) in 'sidekiq 2.14'.

CHANGELOG

@@ -32,6 +32,7 @@ v 7.0.0
   - File action in satellites uses default 30 seconds timeout instead of old 10 seconds one
   - Overall performance improvements
   - Skip init script check on omnibus-gitlab
+  - Be more selective when killing stray Sidekiqs
 
 v 6.9.2
   - Revert the commit that broke the LDAP user filter

bin/background_jobs

@@ -18,7 +18,7 @@ function stop
 
 function killall
 {
-  pkill -u $gitlab_user -f sidekiq
+  pkill -u $gitlab_user -f 'sidekiq [0-9]'
 }
 
 function restart