Validate that the provided XML shmem name is not directory specific to "."  or
".." as well as ensure that there is no path separator '/' in the name.

https://bugzilla.redhat.com/show_bug.cgi?id=1192400Signed-off-by: NSimon Kobyda <skobyda@redhat.com>
Reviewed-by: NMartin Kletzander <mkletzan@redhat.com>