Fix url validaton failures (#2783)

While analyzing failure of the report schema validation i found URL looks like that: `https://ubuntu.com/security/notices/USN-5051-4 (regression only in trusty/esm)`. This causing gitlab to mark report as invalid. Patch provided just using first word of the url word.

contrib/gitlab.tpl

@@ -70,7 +70,7 @@
           ,
         {{- end -}}
         {
-          "url": "{{ . }}"
+          "url": "{{ regexFind "[^ ]+" . }}"
         }
         {{- end }}
       ]