Revert "Don't try to stop dnsmasq if we've already removed the init script"

This reverts commit b16d5f977b8d08aeec700228d1390e5672922fc6.

Change-Id: I52547d39a29c087e7206a517af8c04a6233ced9a
Revert "Remove /etc/init.d/dnsmasq on labs network nodes."

This reverts commit 1b4f6128f4fc61f066944a3e1178c092e72a3d98.

Change-Id: Iab39e2b2460318de95ceb0a7a52de17f3601731c