puppet: update list of Jenkis plugins to satisfy dependencies

Fixes:

| java.io.IOException: Dependency credentials (1.25), git-client (1.19.6), ssh-credentials (1.11) doesn't exist
| java.io.IOException: Dependency icon-shim (2.0.2) doesn't exist
| java.io.IOException: Dependency workflow-step-api (1.9) doesn't exist

causing Git configuration to not being present in config.xml
of jenkins-debian-glue-source.

Thanks: youam the bug report

puppet/jenkins_debian_glue.pp

@@ -136,6 +136,16 @@ class jenkins::software {
     require => Package['jenkins'],
   }
 
+  # required for recent versions of credentials
+  jenkins::plugin::install { 'icon-shim':
+    require => Package['jenkins'],
+  }
+
+  # required for recent versions of credentials
+  jenkins::plugin::install { 'ssh-credentials':
+    require => Package['jenkins'],
+  }
+
   jenkins::plugin::install { 'git-client':
     require => Package['jenkins'],
   }
@@ -154,6 +164,11 @@ class jenkins::software {
     require => Package['jenkins'],
   }
 
+  # required for recent versions of ssh-agent
+  jenkins::plugin::install { 'workflow-step-api':
+    require => Package['jenkins'],
+  }
+
   jenkins::plugin::install { 'tap':
     require => Package['jenkins'],
   }