Refactors and deprecation removals

[caphrim007]

SUMMARY

This patch is primarily a refactor to make the validate-modules arg-spec
no longer generate a traceback. It additionally includes removal of deprecated
code in the virtual server module.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

various f5 modules

ANSIBLE VERSION

ansible 2.5.0
  config file = /here/test/integration/ansible.cfg
  configured module search path = [u'/here/library']
  ansible python module location = /usr/local/lib/python2.7/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 2.7.14 (default, Dec 12 2017, 16:55:09) [GCC 4.9.2]

ADDITIONAL INFORMATION

[ansibot]

cc @Qalthos @ganeshrn @gundalow @kedarX @privateip @rcarrillocruz @trishnaguha
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[ansibot]

The test ansible-test sanity --test validate-modules [?] failed with the following errors:

lib/ansible/modules/network/f5/bigip_vlan.py:0:0: E309 version_added for new option (cmp_hash) should be 2.5. Currently 0.0
lib/ansible/modules/network/f5/bigip_vlan.py:0:0: E309 version_added for new option (dag_round_robin) should be 2.5. Currently 0.0
lib/ansible/modules/network/f5/bigip_vlan.py:0:0: E309 version_added for new option (dag_tunnel) should be 2.5. Currently 0.0
lib/ansible/modules/network/f5/bigiq_regkey_pool.py:0:0: E321 Exception attempting to import module for argument_spec introspection

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