fix: allow plus signs in ppa

    From Launchpad:

    > At least one lowercase letter or number, followed by letters, numbers,
    > dots, hyphens or pluses. Keep this name short; it is used in URLs.

Author: moritz-makandra

manifests/ppa.pp

@@ -40,7 +40,7 @@
   }
 
   # Validate the resource name
-  if $name !~ /^ppa:([a-zA-Z0-9\-_.]+)\/([a-zA-z0-9\-_\.]+)$/ {
+  if $name !~ /^ppa:([a-zA-Z0-9\-_.+]+)\/([a-zA-z0-9\-_.+]+)$/ {
     fail("Invalid PPA name: ${name}")
   }
 

spec/defines/ppa_spec.rb

@@ -50,6 +50,8 @@ def ppa_exec_params(user, repo, distro = 'trusty', environment = [])
     'ppa:foo/bar1.0',
     'ppa:foo10/bar10',
     'ppa:foo-/bar_',
+    'ppa:foo/bar+',
+    'ppa:foo+/bar',
   ].each do |value|
     describe 'valid resource names' do
       let :facts do