Revert "[maven-release-plugin] prepare release 3.0.0-M1"

This reverts commit 766a946a8db4b7b7fe0f51e70264a8dbd76ffb45.

Conflicts:
	coap/pom.xml
	codec/pom.xml
	core/pom.xml
	distribution/pom.xml
	examples/pom.xml
	http/pom.xml
	pom.xml
	protobuf/pom.xml
	thrift/pom.xml
9 files changed