Fix Zend_Db issues with php8

[falkenhawk]

1. (replaces Catch ValueError on PHP 8.0 for Pdo Statement #85) PHP 8.0+ throws ValueError on invalid arguments. Catch ValueError on wrong "fetch" value passed to pdo methods, transform it to expected Zend_Db_Statement_Exception and test for different error message php. Fixes following fatal errors:

• PDOStatement::setFetchMode(): Argument #1 ($mode) must be a bitmask of PDO::FETCH_* constants
• PDOStatement::fetchAll(): Argument #1 ($mode) must be a bitmask of PDO::FETCH_* constants
• PDOStatement::fetch(): Argument #1 ($mode) must be a bitmask of PDO::FETCH_* constants

2. allow case insensitive comparison in a zend db static test

• Prevents following test failure: Failed asserting that 'include_once(Test/MyCompany2/Dbadapter.php): Failed to open stream: No such file or directory' contains "failed to open stream".

3. remove wrong conditions for targeting PHP < 5.2.0 in zend-db tests. Only minor <= 2 was checked, resulting few tests to be skipped on php 8.0 (and 7.0 & 7.1). Removed the false-path completely as php <5.3 is not supported

refs:

• PHP 8.0 porting status #51

[falkenhawk]

Note: even though there is still a fatal error caused by ValueError in another place, all (configured) zend-db tests run on php8, which can be checked at https://github.com/zf1s/zf1/runs/3707648107?check_suite_focus=true - only Zend\Db\AllTests.php was executed there.

Note 2: Running Zend\Db\AllTests.php directly with phpunit also omitted other disabled adapters - effectively avoiding a fatal error with missing DB2 constant - so we might not need fixes from #83 after all /cc @glensc

[glensc]

@falkenhawk It's great that you're able to finish my started work.