Explicitly handle quoting/unquoting of NSSNickname directive
Improve the single/double quote handling during parsing/unparsing of
nss.conf's NSSNickname directive. Single quotes are now added/stripped
explicitly when handling the certificate nickname.
https://fedorahosted.org/freeipa/ticket/6460
Reviewed-By: Tomas Krizek <tkrizek@redhat.com>
Reviewed-By: Petr Spacek <pspacek@redhat.com>