Instead of doing an unpack, deliberately specify which parameters you
want to use. This allows us to flexibly add more parameters to the
f5_argument_spec without having to rewrite all the modules that use
it.
Functionally this commit changes nothing, it just provides for a
different way of accessing the parameters to the module
As is done in other ansible modules, this adds the __main__ check
to the module so that the module code itself can be used as a library.
For instance, when testing the code.
This allows one to enable or disable a node, useful for when doing
maintenance on a node to prevent connections from being attempted to it.
This will completely disable the node for any pool it might be in.
