KCM: Add some forgotten NULL checks Several memory allocations across the KCM codebase did not check their result for NULL. This patch fixes that. Reviewed-by: Fabiano Fidêncio <fidencio@redhat.com>

KCM: Add a in-memory credential storage Implements a simple back end for the ccache module that lets the KCM server store credentials directly in memory. Reviewed-by: Michal Židek <mzidek@redhat.com> Reviewed-by: Simo Sorce <simo@redhat.com>