In order to have sd_notify from systemd to work in containers
we need to pass down the NOTIFY_SOCKET environment variable to
the container.
LISTEN_FDS, tells the application inside of the container to use
socket activation and grab the FDS that are leaked into the container.
Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>
Closes: #271
Approved by: umohnani8
