Refactor functional tests

* Reduce amount of time waiting for element that doesn't exist
* Improve some xpaths
* Fix screenshot taking to happen only on fail
* Add config file to .gitignore
* Testcase for checking integer field was removed since
  it checks library code, not Murano
* Generates test package archive with different fqns
* Use muranoclient insted of request module
* Maximaze browser window before test execution
* Use consts.py instead of common.ini to keep xpaths

After this patch app-incubator is not needed for test run

Closes-Bug: #1343210
Change-Id: Ied6390b5aed6421182a2f2e3a825e079cfef4591
Merge "Refactor functional tests"