VMM/Domain: added function get_gid() to the Domain module.
We don't need to load all the domain related information from the
database, when we need only the GID of a domain. For example in the
Alias or Relocated classes.
.. Substitutions in section 5
.. |account.password_length| replace:: **password_length**
.. |misc.password_scheme| replace:: **misc.password_scheme**
.. |vmm configure| replace:: **vmm configure**
.. _`vmm configure`: vmm.1#configure
.. |domainadd| replace:: **domainadd**
.. _domainadd: vmm.1#domainadd
.. |domaindelete| replace:: **domaindelete**
.. _domaindelete: vmm.1#domaindelete
.. |useradd| replace:: **useradd**
.. _useradd: vmm.1#useradd
.. |userdelete| replace:: **userdelete**
.. _userdelete: vmm.1#userdelete
.. |userinfo| replace:: **userinfo**
.. _userinfo: vmm.1#userinfo
.. non vmm
.. |virtual_alias_expansion_limit| replace:: `virtual_alias_expansion_limit`
.. _virtual_alias_expansion_limit:
http://www.postfix.org/postconf.5.html#virtual_alias_expansion_limit
.. #EOF