Replace invalid_params with ValueError

[LindsayHill]

SUMMARY

Extreme networking modules returned self.invalid_params - this was not valid, and the new pattern is to use raise ValueError() - see #43643

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

plugins/cliconf/exos.py
plugins/cliconf/ironware.py
plugins/cliconf/nos.py
plugins/cliconf/slxos.py
plugins/cliconf/voss.py

ANSIBLE VERSION

ansible 2.7.0.dev0 (invalid_params 98115727e8) last updated 2018/08/22 16:35:18 (GMT -700)
  config file = /Users/lhill/github/ansible-extreme/slxos/playbooks/ansible.cfg
  configured module search path = [u'/Users/lhill/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /Users/lhill/github/ansible/lib/ansible
  executable location = /Users/lhill/github/ansible/bin/ansible
  python version = 2.7.10 (default, Oct  6 2017, 22:29:07) [GCC 4.2.1 Compatible Apple LLVM 9.0.0 (clang-900.0.31)]

ADDITIONAL INFORMATION

Also fixes pylint warning E: 57,19: Instance of 'Cliconf' has no 'invalid_params' member (no-member)

[ansibot]

cc @Qalthos @bigmstone @ganeshrn @gdpak @justjais @paulquack @rcarrillocruz @rdvencioneck @trishnaguha
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