pgAdmin 4 commit: Resolve the log in issue for a user having a non-exis

Resolve the log in issue for a user having a non-existing email id

  1) Added CHECK_EMAIL_DELIVERABILITY & SECURITY_EMAIL_VALIDATOR_ARGS.
  2) Added test cases for deliverability check.

Fixes #6550

Branch
------
master

Details
-------
https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=9fdda038a9eebc978ca597baa709f88069b93c03
Author: Rahul Shirsat <rahul.shirsat@enterprisedb.com>

Modified Files
--------------
web/config.py                                      |  4 +-
web/pgadmin/__init__.py                            |  2 +
.../setup/tests/test_no_email_deliverability.py    | 62 ++++++++++++++++
web/pgadmin/setup/user_info.py                     | 12 ++--
.../tools/user_management/tests/__init__.py        |  0
.../tests/test_validate_user_email.py              | 62 ++++++++++++++++
web/pgadmin/utils/constants.py                     |  2 +
web/pgadmin/utils/tests/test_validate_email.py     | 82 ++++++++++++++++++++++
web/pgadmin/utils/validation_utils.py              | 25 +++----
web/regression/python_test_utils/test_utils.py     | 32 +++++++++
10 files changed, 265 insertions(+), 18 deletions(-)