From: Daniel Lezcano <dlezcano@fr.ibm.com>

Previously, we dropped the CAP_SYS_BOOT capabilty. Unfortunatly if we are
non root user, we are not able to do that. So I had the CAP_SETPCAP to
lxc-execute and lxc-start command line to remove this capabilty.
Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>