Allow licenses to meet the user limit exactly

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/232

app/models/license.rb

@@ -102,7 +102,7 @@ class License < ActiveRecord::Base
 
     return unless active_user_count
 
-    return if active_user_count < restricted_user_count
+    return if active_user_count <= restricted_user_count
 
     overage = active_user_count - restricted_user_count
 

spec/models/license_spec.rb

@@ -79,6 +79,15 @@ describe License do
           expect(license).to be_valid
         end
       end
+
+      context "when the active user count is met exactly" do
+        it "is valid" do
+          active_user_count = 100
+          gl_license.restrictions = { active_user_count: active_user_count }
+
+          expect(license).to be_valid
+        end
+      end
     end
 
     describe "Not expired" do