Lower mistral-executor nofile to 1024
Lower mistral-executor nofile to 1024

Containers inherit file descriptor limit from docker daemon (currently:1048576)
which is very high causing python2 subprocess to take very long and ansible
facts gathering to time out.

This patch defaults nofile limit to 1024 for mistral-executor, like it is
on the baremetal node.

Co-Authored-By: Yatin Karel <ykarel@redhat.com>

Change-Id: Ia76fcb87fc98fd93d6f487dd40d407c0bc875ffd
Related-Bug: 1806073

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates