Merge branch 'dependencies/#6932-zend-xmlrpc-may-require-zend-cache'

Close #6932
remove PHP_VERSION_ID check before 50323
remove backwardCompatibility set at Bcrypt
fixes cs for unused use ReflectionClass
re-added back compatibility methods in Bcrypt class
fixes cs
return is_subclass_of directly
left out ((PHP_VERSION_ID >= 50304) || strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN')
return is_subclass_of($className, $type) directly at AutoloaderFactory
#6785 - disabling `Zend\Crypt\Bcrypt#setBackwardCompatibility()`
#6785 - using `is_subclass_of()` instead of protected static method usage

See bug https://bugs.php.net/bug.php?id=53727
See bug https://github.com/zendframework/zf2/pull/1807

Deprecating protected static polyfill method `isSubclassOf`
#6785 - using `is_subclass_of()` instead of protected static method usage

See bug https://bugs.php.net/bug.php?id=53727
See bug https://github.com/zendframework/zf2/pull/1807

Deprecating protected static polyfill method `isSubclassOf`
#6785 - using `is_subclass_of()` instead of protected static method usage

See bug https://bugs.php.net/bug.php?id=53727
See bug https://github.com/zendframework/zf2/pull/1807

Deprecating protected static polyfill method `isSubclassOf`
#6785 - using `is_subclass_of()` instead of protected static method usage

See bug https://bugs.php.net/bug.php?id=53727
See bug https://github.com/zendframework/zf2/pull/1807

Deprecating protected static polyfill method `isSubclassOf`
#6785 - using `is_subclass_of()` instead of protected static method usage

See bug https://bugs.php.net/bug.php?id=53727
See bug https://github.com/zendframework/zf2/pull/1807

Deprecating protected static polyfill method `isSubclassOf`
Merge branch 'hotfix/#6785-remove-version-checks-for-incompatible-versions'

Close #6785
Merge branch 'hotfix/#6785-remove-version-checks-for-incompatible-versions' into develop

Close #6785
Forward port #6785
allow header field value of "0"

'0' is a valid value for headers, such as content-length
fixing previous, allow arrays for header values
re-adding test, fixing empty string test on arrays