Revert "Merge branch 'master' into 2.0"

Reverting this for now, until HA tests are stable again

This reverts commit 869ec9b18bc91b4961e95e20b02ad94c18c60abf, reversing
changes made to fbf1d57c65cbd620f0568f8a8f9c773f3a605427.

Conflicts:
	community/cypher/src/docs/dev/index.asciidoc
	community/cypher/src/docs/dev/ql/functions/index.asciidoc
	community/cypher/src/test/scala/org/neo4j/cypher/internal/executionplan/builders/TraversalMatcherBuilderTest.scala
Revert "Ignored failing HA tests"

This reverts commit 4935d944a8e3a1eed8d7c964ac5e94472838add7.
Revert "Ignoring HA tests for now"

This reverts commit 169adaf0360a730251e84d0950a6403dcab9d62b.
Merge pull request #663 from systay/undo-master-merge

Undo master merge