BZ-1069568 - Variable instance history REST operations are at wrong path
(cherry picked from commit 2953399b3d980b96f1566db2007c0c3241445206)
BZ-1069216 - NPE when I get a process instance history via REST API in EWS
(cherry picked from commit 944bafd859d35466dca859f8dfa47720f47802fe)