hma: add op_eq_all operator to hma.conf. it evaluates equality of all results from nodes.
fix HA enabled instance in halted state had been dealt same as instances in running state.
Merge pull request #484 from axsh/fix-hma-conf-operator

hma: add op_eq_all operator to hma.conf.
Merge pull request #491 from axsh/fix-ha-halted-instance

Fix HA enabled instance in halted state was scheduled to run.
Merge remote branch 'origin/master' into integration_test_nat