Add -H to sudo on (twn|sandbox)-update-all

composer stores cache data on home dir (ugh) and the permissions
will get messed up when ran under sudo. -H sets the home dir
to the one of the target user. Thus different users would share
the same cache and would not mess permissions in own home dirs.

Doesn't seem to have any side effects on local testing.

Change-Id: I87c4fa92e19f91c78cf71fad9ecd30a0d1777760
Merge "Add -H to sudo on (twn|sandbox)-update-all"