BUG-509: make the tree-based datastore the default

This patch switches the default datastore implementation to the
tree-based one.

Change-Id: Ibec4b2ba7f879bcd5a1c9676a59d9984cd7b4371
Signed-off-by: Robert Varga <rovarga@cisco.com>
BUG-509: remove the key/value datastore

This patch puts the legacy buggy datastore to rest.

Change-Id: If87f8801fe6d370a9244ce8c2d9a586df1502285
Signed-off-by: Robert Varga <rovarga@cisco.com>
Merge "BUG-509: make the tree-based datastore the default"
Merge "BUG-509: remove the key/value datastore"