service: Only accept specific characters when parsing MSCLDAP response
service: Only accept specific characters when parsing MSCLDAP response

This provides an extra layer of protection against injecting
odd characters into configuration files.

freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd,freedesktop-unofficial-mirror/realmd__realmd