otter2: remove local releasetools

Change-Id: I4a95577e44cac523c2d62dcd02fe97280c37ace3
otter2: use unified releasetools

Change-Id: Iab3556c9fce4e942a7f40622593e4a2cfac76b9f
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_amazon_otter2 into cd-4.4