py3: configparser: use raw keyword
configparser.get() changed in python3 and `raw` is now a keyword attribute.
Also it must be set to True, otherwise InterpolationSyntaxError is raised
'''
InterpolationSyntaxError: '%' must be followed by '%' or '(', found:
'%2fvar%2frun%2fslapd-EXAMPLE-COM.socket'
'''
https://fedorahosted.org/freeipa/ticket/4985
Reviewed-By: Jan Cholasta <jcholast@redhat.com>