hadoop: mark our rc.local replacement as executable
hadoop: mark our rc.local replacement as executable

On SysV and upstart rc.local is shipped as executable, but it seems to
be executed regardless, so this just makes our rc.local as the distro
one.

On systemd, though, rc.local is a compatibility script, and to run it
must be executable; hence, make it +x so it can run.

Change-Id: I62bf72f6afb0b58b7552ae94331a3347443ef0af

bigfootproject/sahara-image-elements,openstack/sahara-image-elements,bigfootproject/sahara-image-elements,crobby/sahara-image-elements,uladz/sahara-image-elements,crobby/sahara-image-elements,openstack/sahara-image-elements,uladz/sahara-image-elements