Log when unable to create modular Fail Safe data directory
Log when unable to create modular Fail Safe data directory

Closes: #774
Approved by: j-mracek

hughsie/libhif,rpm-software-management/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,hughsie/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,rpm-software-management/libhif,rpm-software-management/libdnf,rpm-software-management/libdnf