admin.conf: quote auto_allow_cli variable

apache2 won't start with auto_allow_cli=0:

| [error] /etc/ngcp-www-admin/admin.conf:26: parser error : AttValue: " or ' expected\n              auto_allow_cli=0\n
|         ^\n/etc/ngcp-www-admin/admin.conf:26: parser error : attributes construct error\n              auto_allow_cli=0\n

So use auto_allow_cli="..." instead.

From: Michael Prokop <mprokop@sipwise.com>

etc/admin.conf

@@ -27,7 +27,7 @@
   <dashboard enabled="[% www_admin.dashboard.enabled %]" />
   <subscriber extension_features="[% www_admin.subscriber.extension_features %]"
               audiofile_features="[% www_admin.subscriber.audiofile_features %]"
-              auto_allow_cli=[% www_admin.subscriber.auto_allow_cli %]
+              auto_allow_cli="[% www_admin.subscriber.auto_allow_cli %]"
             />
   <domain rewrite_features="[% www_admin.domain.rewrite_features %]"
           preference_features="[% www_admin.domain.preference_features %]"