Revert "SPARK-3039: Allow spark to be built using avro-mapred for hadoop2"

This reverts commit 78887f94a0ae9cdcfb851910ab9c7d51a1ef2acb.

Conflicts:
	pom.xml
Revert "[maven-release-plugin] prepare for next development iteration"

This reverts commit 5c0032a471d858fb010b1737ea14375f1af3ed88.
Revert "[maven-release-plugin] prepare release v1.1.1-rc1"

This reverts commit f3e62ffa4ccea62911207b918ef1c23c1f50467f.

Conflicts:
	pom.xml
[maven-release-plugin] prepare release v1.1.1-rc1