Merge branch 'hotfix/#6867-fix-eventmanagerinterface-short-circuiting-response-reaction-value'

Close #6867
See facebook/hhvm#1221
See facebook/hhvm#2018
See https://github.com/facebook/hhvm/blob/HHVM-3.3.1/hphp/doc/inconsistencies

Conflicts:
	tests/ZendTest/Http/ClientTest.php
fixing http query parameters

Zend\Stdlib\Parameters is not converted to PHP array in HHVM
Merge branch 'hotfix/#6231-fix-http-query-parameters-to-array-cast-on-hhvm'

Close #6231
Forward port #6231