Fix netapp_spec and pass a correct url

The netapp network device initialize method expects a NetApp filer and
no URL. This is now respected in the spec test.

Note: You might see some "Error : " messages messing the rspec output.
This is because the NetApp SDK likes to talk about the expected
exceptions.
Make it easier to execute NetApp API calls

The netapp provider now offers a method `netapp_commands` that works
similar to the `commands` provider method:

1) It makes it possible to define seperate methods for each api call you
   want to use
2) it will print a debug message for each api call
3) it raises an expection whenever the api call fails

Example: Inside your provider you can define a seperate method for the
`qtree-create` api call:

    netapp_commands :add => 'qtree-create'

in your `create` method you can now write the following:

    add 'qtree', 'q1',  'volume', 'vol1'

which will automatically invoke the `qtree-create` api call and pass all
the arguments to it.
Merge branch 'feature/master/api_helper_methods' of https://github.com/stschulte/fatmcgav-netapp into stschulte-feature/master/api_helper_methods
(#34) Updated netapp_qtree to use api_helper netapp_commands.
(#33) Needed to add an additional def which referenced
self.netapp_command.
(#33) Removing un-necessary def.
(#36) Updated Netapp_user type and associated spec file to fix failing
tests.
(#34) Updated netapp_user provider to use netapp_commands api helper
method.
(#35) Autorequire the netapp_group for a given netapp_user.
Fixed a Ruby warning for 'parenthesize argument(s) for future version'.
(#34) Updated to use netapp_commands api helper.
(#36) Lots of :name rather than :username.
(#38) Updated type and unit tests.
(#39) Update netapp_role type and spec tests.
(#34) Updated netapp_role provider to use netapp_commands api_helper.
(#40) Fixed the failing netapp_export tests.
(#42) Updated netapp_export type to auto-require the appropriate
netapp_volume/netapp_qtree resources. Also updated spec tests.
Fixed a couple of errors on netapp_user, netapp_group and netapp_role.
(#42) Updated netapp_export autorequires and associated spec test.
(#44) Updated netapp_volume tests.