Add the ability to set rlimits on the jailed process

Currently Chrome OS relies on upstart to configure these limits but
that isn't available when using libminijail from session manager.  Add
it so runtime limits can be configured for Android and other containers.

BUG=none
TEST=updated security_Minijail0 and manually check /proc/xxx/limits of
jailed process.

Change-Id: I62ed63c89c9c5196b7d9873520b396c9524e5855
Signed-off-by: Dylan Reid <dgreid@chromium.org>
4 files changed