Merge branch 'stable-2.9' into stable-2.10

* stable-2.9:
  Release notes for Gerrit 2.9.3
  Set version to 2.9.3
  Update sha1 for sshd-core 0.9.0-4-g5967cfd

Conflicts:
	VERSION
	gerrit-extension-api/pom.xml
	gerrit-plugin-api/pom.xml
	gerrit-plugin-archetype/pom.xml
	gerrit-plugin-gwt-archetype/pom.xml
	gerrit-plugin-gwtui/pom.xml
	gerrit-plugin-js-archetype/pom.xml
	gerrit-war/pom.xml

Change-Id: I9243054c1ecf7539e39194886f5af4cf3565a389