Add an installd command to link files

Given a pair of absolute paths {from_path, to_path} , check that
they are both valid apk subpaths (eg. /data/app/package/foo) and
link(2) to_path to from_path. This is required by staged installs,
where we link existing apks and oat files to their staging location.

bug: 20889739
Change-Id: I3b5e3b43677af68be59308121a4409caaa6a72f0