Call _check_self() in UIRTSLibNode.execute_command()
Call _check_self() in UIRTSLibNode.execute_command()

The object may load its driver in response to check_self(), and will
throw an exception if things go wrong.

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

Datera/targetcli,Datera/targetcli