Remove references to PHP 7.0 in tests (only removing lines)

[kubawerlos]

This is first part of removing PHP 7.0 references from code - with only removing obvious stuff, to make easy review.

This touches 50 files, so more interesting changes will be in separate PR.

Most of the fixes are when having:

testFix
provideFixCases
testFix70
provideFix70Cases

is removing testFix70 and merging the providers.

[coveralls]

Coverage decreased (-0.01%) to 92.294% when pulling 8a86d48 on kubawerlos:remove_references_to_php_7.0_in_tests into e9aa4c8 on FriendsOfPHP:3.0.

[keradus]

Thank you @kubawerlos.