add zabbix modules

[cove]

add zabbix modules for groups, hosts screens and webchecks

[resmo]

this boilerplate is deprecated (also see http://docs.ansible.com/developing_modules.html#common-module-boilerplate), you should use

from ansible.module_utils.basic import *
main()

[cove]

thanks @resmo, updated.

[resmo]

@cove they merged my zabbix_group module. I am asking to revert it, so this can be pulled in.

[resmo]

remove this line, duplicate of https://github.com/ansible/ansible-modules-extras/pull/44/files#diff-52e41b51661c5ff9d2854b88d297d200R391

[cove]

@resmo sounds good, thanks for helping review.

[bcoca]

Can you make this a separate request per module, its easier to review and add individually.

i'm guessing the rebase is needed because of the zabbix_group module we already merged
@resmo I did not see your request to defer to these modules.

[cove]

re-submitted as #343, #344, #345 and #346

NB: the zabbix_webcheck module is no longer needed in recent versions of zabbix, the zabbix_hostmacro module is used instead.