Marathon-LB v1.12.0-1.8.4-beta-7

Noteworth changes(s):

• Filter tasks by state: Exclude TASK_KILLING, TASK_KILLED, TASK_FINISHED, and TASK_ERROR before adding them to a backend.
• Fix broken builds due to upstream dependency change: python3 depends on make (python3 > dh-python > dpkg-dev > make)
• Fix bug in config validation and reduce marathon calls

Full changelog:

v1.12.0-1.8.4-beta-6...v1.12.0-1.8.4-beta-7

Shortlog:

$ git shortlog v1.12.0-1.8.4-beta-6...v1.12.0-1.8.4-beta-7
drewkerrigan (2):
      Fix bug in config validation and reduce marathon calls Upgrade pip and setuptools
      Fix lint problems

[email protected] (2):
      Work around python3 > dh-python > dkpg-dev > make dependency
      filter by bad states rather than accepting only one good state