1. Reworked the parser syntax to use proper Oracle escaping syntax as '' instead of \'.
2. Moved valid tests to the Functional section to ensure correct SQL syntax and logic.

Single drivers get and return various types in quote(), the
interface docs should reflect that.

[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

The current driver has no option to allow the usage of SSL connections on mysql. I've used the same name params as mysql client.
An example of mysql client usage would be:

mysql --ssl-ca='path_to_ca.pem' --ssl-cert='path_to_client_cert.pem' --ssl-key='path_to_client_key.pem'

refactor secure connection as params

remove space

add space

refactor secure connection

rename method

rename method

docs: add ssl params to use in mysqli driver

rename test method

refactor method setSecureConnection

fix bug

add comment to method

remove string escaping

Replacing spaces in the pgsql dsn string with semicolons as this is more consistent with the other drivers and makes the PDOPgSQL driver work in hhvm 3.15.2 as well.

Closes #2261
Closes #2262
Closes #2386

I am also of the opinion that the resource type checks are unhappy. We depend on driver internals.

When following error message is shown, then it will get converted to the
correct Exception classs of NotNullConstraintViolationException:

  PDOException: SQLSTATE[HY000]: General error: 1364 Field '...' doesn't have a
  default value

* removed "charset" patch
* implemeted resource_type compare with in_array instead of regex
* implemented functional tests for connection and statement.

Revert "build a correct connection string for mirrored databases, too. In this case "host=ip1:port,ip2:port" servername and dbname are optional but can also be used without host parameter"

This reverts commit 0698cba6.

build a correct connection string for mirrored databases, too. In this case "host=ip1:port,ip2:port"
servername and dbname are optional but can also be used without host parameter

if $persistent=false, resource_type == 'SQLAnywhere connection'