tcmu-runner: increase max open file descriptors limit
tcmu-runner: increase max open file descriptors limit

In some environments default 'Max open files' will be 1024. As the number of
block create increases, open FDs also increases in daemon process quota and
in case if open fd limit is reached, then bock create will result in open() call
failures with EMFILE.

Solution is to set the 'Max open files' limit to higher value in tcmu-runner

Signed-off-by: Prasanna Kumar Kalever <a78d8f98557446023f5b3ba9944d7be259a978a3@redhat.com>

agrover/tcmu-runner,open-iscsi/tcmu-runner,open-iscsi/tcmu-runner