fix publish custom frontend url
simplify monitoring connection parameters

/reviewed-by: TrustMe

This causes Cloudooo to not listen anymore.

/reviewed-on nexedi/slapos!75

* now glib is built with our own pcre.
* libsigc++, glibmm, pangomm and atkmm are kept in older version because glibmm >= 2.46 requires C++11 compiler.

  The password and username has to be passed to the others instances and used

Define a simple cache implementation using a Dict (Singleton) to prevent call registerComputerPartition
  multiple times over the sections.

/reviewed-on nexedi/slapos!74

  When create a wrapper for etc/service/my-wrapper placing the 2 files
  at the same folder, cause one duplication at the files added to supervisord, so
  always place the python script wrapper at the bin folder of the buildout.

  Ensure the certificates provided by the user actually valid and match, otherwise prevent it write bad certificates.

This allows enabling replication later without requiring a mariadb restart.
For now, nothing passes the internal server-id instance parameter, so
replication is not.