Dev

* Fixed the potential error reported by Prefast code analysis

* Use SQLSRV_ASSERT for checking NULL ptrs

* For these AKV tests check env despite not AE connected

* Added the driver option to run functional tests

* Fixed connection pooling tests for more than one ODBC drivers

* added driver option to pdo isPooled.php

* Removed win32 ifdefs re connection resiliency (#802)

* Set the driver argument for getDSN to null by default (#798)

* Added the driver argument to getDSN

* Dropped the driver argument but set to null as default

* Removed the AE condition in locale support

* Modified the AE condition for locale support

* Changed int to SQLLEN to avoid infinite loop (#806)

* Version 5.3.0 (#803)

* Version 5.3.0

* Fixed the wrong replacements

* Added comments block to m4 files

* Use dnl for comments

*  Modified AE fetch phptypes test to insert only one row at a time and loop through php types (#801)

* Modified AE fetch phptypes test to insert only one row at a time and loop through php types

* Fixed formatting

* Streamlined two very similar large column name tests (#807)

* Streamlined two very similar large column name tests

* Changed the EOL

* Updates to change log and readme (#811)

* Updates to change log and readme

* Dropped support for Ubuntu 17

* Modified as per review comments

* Fixed connection resiliency tests for Unix, updated AppVeyor for ODBC 17.2

* Fixed expected output

* Fixed output and skipifs

* Fixed skipifs and output

* Fixed driver name

* Updated installation instructions and sample script (#813)

* Updated instructions and sample test for 5.3.0 RTW

* Fixed sample code to adhere to php coding standard

* Fixed cases and spaces

* Modified NOTE for UB 18.04 based on review comments

* Added 'exit'

* Modified change log and readme based on review to PR 811

* Applied review comments

* build output to debug appveyor failure

* removed debug output

* Streamlined two very similar large column name tests (#815)

* Streamlined two very similar large column name tests

* Added random number of test table names to avoid operand clash issues

* Replaced to with for based on review

* Changelog updated

* changelog updated, test skipif changed to run on unix platforms

* Fixed skipif typo

* Fixed typo in skipif for pdo

* Fixed some output for Travis

* Moved error checking inside pdo connres tests

* Added links back to changelog

* Fixed output for sqlsrv connres tests

* Fixed output

* Fixed output again