* Fix lookup_passwordstore test skipping.
Skip all of RHEL instead of specific versions.
Skip all of CentOS < 7 instead of specific versions.
This makes the test more robust when testing newer versions.
Tests could be executed on RHEL if EPEL was installed during the test.
(cherry picked from commit 704dae2cda)
* Update Shippable integration test groups.
* Update integration test group aliases.
* Rebalance AWS and Azure tests with extra group.
* Rebalance Windows tests with another group.
* [password] _random_password -> random_password and moved to util/encrypt.py
* [passwordstore] Use built-in random_password instead of pwgen utility
* [passwordstore] Add integration tests
