Raise RTSLibError if trying to create invalid entry in configfs
Raise RTSLibError if trying to create invalid entry in configfs

rtslib is designed to only throw RTSLib-defined exceptions. Since
the mkdir can fail, wrap it in a try block and convert any errors to
rtsliberrors.

This should fix https://bugzilla.redhat.com/show_bug.cgi?id=830672

Signed-off-by: Andy Grover <b7d524d2f5cc5aebadb6b92b08d3ab26911cde33@redhat.com>

agrover/rtslib-fb,cvubrugier/rtslib-fb,mikenawrocki/rtslib-fb,mikenawrocki/rtslib-fb