UTIL: Add type-specific getsetters to sss_iobuf
The KCM responder receives its input as unstructured data. To make the
parsing easier, this commit adds several type-specific getsetters to the
iobuf module.
Reviewed-by: Michal Židek <mzidek@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>