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.
temporary Merge branch 'fix-hma-conf-operator' into fix-hma-switch-flag
temporary Merge branch 'fix-ha-halted-instance' into fix-hma-switch-flag
test to compare current and previous result.