[server] drop system_source_cnx for a simpler internal API
system_source_cnx() can be replaced with source_cnx().
If system_source_cnx() is called with dbms_system_base=False, it is
strictly equivalent to calling source_cnx() with the same source,
privileges and interactivity.
If system_source_cnx() is called with dbms_system_base=True, it is
equivalent to calling source_cnx() with the system database and the
same source, privileges and interactivity.
No use of the default value for 'special_privs' was found in the code.
extend-diff-ignore = "^(__pkginfo__\.py$|doc/_themes/cubicweb/static/(logo-cubicweb-small\.svg|cubicweb\.ico|logo-cubicweb\.svg)$|cubicweb\.spec$|setup\.cfg$|cubicweb/misc/cwfs)"