Iscsi Manager and CLI iSCCI Module

New iSCSI manager has been introduced to conveniently work with iSCSI
service provided by SofyLayer. Respective CLI module has also been
introduced for CLI interaction.
Incorporated suggested changes

corrected command listing style and divided iSCSI section and snapshot section.
Renames pop_message() to pop_messages(). Makes pop_message() a convienence method
Merge pull request #310 from sudorandom/messaging-update

Messaging Module Fixup
Modified filter for ISCSI and snapshot Item price IDs
Updating cancel_hardware() so it can cancel BMC as well. This makes the "sl server cancel" command work for all types of bare metal servers.
Revert "Updating cancel_hardware() so it can cancel BMC as well. This makes the "sl server cancel" command work for all types of bare metal servers."

This reverts commit fd58dfada6a0be2fd9c9cd299f30bc4e54663750.
Improved the docopt docs with example, etc.
Using custom response inside tests

Fixure Product_Package has too many things which are not required by the iscsi tests. Using return_value from `mock` to test iscsi manager.
Merge branch 'master' into iscsi-manager
Adds an import test that imports all CLI modules to catch syntax errors and expose it as missing test coverage
Fix copy/paste errors
Print modules being imported (for easier debugging)
Added tests for help and summary CLI modules. Updated network CLI tests
Fixes copy/paste mistake, the best kind of mistake
Adds rwhois and sshkey CLI tests

* Fixes bug where updating rwhois would send fields you don't want updated
* Fixes bug where CLIAbort isn't raised whenever a user cancels deleting an sshkey
Merge pull request #302 from aparnapatil/iscsi-manager

Improves iscsi manager
Merge pull request #316 from sudorandom/test-all-CLI-modules

Adds test that imports all CLI modules
Merge branch 'master' of github.com:softlayer/softlayer-api-python-client
First rename, changing the CCIManager to VSManager and created a new CCIManager that subclassed VSManager with a deprecated warning. Used existing tests to verify that code still works.