AI 144143: Define OTA_PUBLIC_KEYS to be the test keys in the otapackage   target as well.
AI 144143: Define OTA_PUBLIC_KEYS to be the test keys in the otapackage
  target as well.

Automated import of CL 144143

hagar006/platform_manifest,ND-3500/platform_manifest,xorware/android_build,fallouttester/platform_manifest,see4ri/lolili,xorware/android_build,xorware/android_build,xorware/android_build,xorware/android_build,knone1/platform_manifest,RR-msm7x30/platform_manifest,pranav01/platform_manifest,Hybrid-Power/startsync