handle later iniparser version assigning a zero length string value for 'key='

handle later iniparser version assigning a zero length string value for 'key='

older iniparser versions ( like that used in upstream samba ) ignore 'key='
entries, the key is not entered into the dictionary at all. Later
versions of iniparse specifically handle the following special cases

* key=
* key=;
* key=#

by assigning a value of "" ( a zero length string ) to the key
in the dictionary.

Signed-off-by: Noel Power <noel.power@suse.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Wed Nov 20 16:12:13 CET 2013 on sn-devel-104