Backport #2546 to 2.5.x

[DBAL-2546] Fixed the failure of `Functional\StatementTest::testReuseStatementWithParameterBoundByReference()` on ibm_db2

The test is partially skipped due to:

1. Fetching blob as binary string from pdo_sqlsrv requires using `PDOStatement::bindColumn()` and `PDOStatement::fetch(PDO::FETCH_BIND)` which are not supported by the DBAL.
2. Setting encoding on the connection level is not supported: https://msdn.microsoft.com/en-us/library/ff628164(v=sql.105).aspx

[DBAL-2546] Fixed the failure of `Functional\StatementTest::testIncompletelyFetchedStatementDoesNotBlockConnection()` on pdo_mysql + libmysql

The test case being fixed should reset shared connection during teardown as one if its methods modifies connection attributes.

Backport #2611 to 2.5
Backport #2508 to 2.5

Backport #2555 to 2.5
Backport #2612 to 2.5

Merge branch 'fix/#2511-#2609-correct-identifier-and-data-type-collisions-in-list-type-extraction' into 2.5

Close #2511
Close #2609

Close #2608
Close #2586

Minor code cleanup for efficiency, and tests to check the order by clause scrubbing is working correctly and not entering an infinite loop

Allow doctrine/common 2.7

Merge branch 'fix/#2318-fix-listing-table-columns-when-using-external-or-os-authentication-on-oracledb-2.5' into 2.5

Close #2318
Close DBAL-831

Close #2302
Close #2303