sss_iobuf: fix 'read' shadows a global declaration Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

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>

UTIL: iobuf: Make input parameter for the readonly operation const Reviewed-by: Michal Židek <mzidek@redhat.com> Reviewed-by: Simo Sorce <simo@redhat.com>

UTIL: Add a generic iobuf module The KCM responder reads bytes and writes bytes from a buffer of bytes. Instead of letting the caller deal with low-level handling using the SAFEALIGN macros, this patch adds a new iobuf.c module with more high-level functions. The core is a iobuf struct that keeps track of the buffer, its total capacity and a current read or write position. There are helper function to read or write a generic buffer with a set length. Later, we will also add convenience functions to read C data types using the SAFEALIGN macros. Reviewed-by: Pavel Březina <pbrezina@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>