Hadoop 3.0.0-alpha2 release

Release candidate -3.0.0-alpha2-RC0

Release candidate - 2.8.0-RC1

Release candidate - 2.8.0-RC0

YARN-5599. Publish AM launch command to ATS (Rohith Sharma K S via Va…

…run Saxena)

YARN-3359. Recover collector list when RM fails over (Li Lu via Varun…

… Saxena)

Hadoop 2.6.5 release

Release candidate - 2.6.5-RC1

Release candidate - 2.6.5-RC0

Hadoop 3.0.0-alpha1 release