Telephony: Add data rat constant

This event constant is used in DcTracker

Change-Id: I1f9b34a8689c43c2586e9e3a92f0453649775d73
(cherry picked from commit f7ca98035479b670ff51bc9298fd7928a5e0f80d)
(cherry picked from commit f4d8f7b8fa390302b9cc51a5640e017ff393dfcc)
(cherry picked from commit 77d810390fbca8cb1d10bce148035fada414e0eb)
Fix a bootloop problem when /data/system/usagestats/usage-history.xml is empty.
This often occurs after an incomplete reboot/shutdown or battery pull.

Change-Id: I4f01151f4051df4ae1b85fa460ec7a9e70122878
Call to equals() comparing different types (FindBugs)

Call to HashSet<PrintServiceInfo>.equals(ArrayList<PrintServiceInfo>).
The result of this comparison will always be false.

Change-Id: Ic8cc6eab99cea4c7b3841faf6bc84c246273e8d0
Properly handle null URIs.

Change-Id: Ib81044686f40284bacf6ee645c671679f62be843
JIRA:CYAN-2491
Merge remote-tracking branch 'magic/kitkat' into kitkat