[AKS] Convert module to use multi-API idioms

[tjprescott]

Is your feature request related to a problem? Please describe.

The latest container service SDK has switched to a multi-API format. The CLI needs to be updated to use multi-API idioms.

In azure.cli.core.profiles._shared.py:
Add an entry in the "latest" profile like this:

AZURE_API_PROFILES = {
    'latest': {
        ResourceType.MGMT_ACS: '2017-07-01',  # you can call this whatever you want
        ResourceType.MGMT_ACS_PREVIEW: '2018_03_31', # looks like you'll need two versions on a given profile.
        ResourceType.MGMT_STORAGE: '2018-07-01',

In init.py for your module:

class ContainerServiceCommandsLoader(AzCommandsLoader):

    def __init__(self, cli_ctx=None):
        from azure.cli.core.commands import CliCommandType
        acs_custom = CliCommandType(operations_tmpl='azure.cli.command_modules.acs.custom#{}')
        from azure.cli.core.profile import ResourceType
        super(ContainerServiceCommandsLoader, self).__init__(cli_ctx=cli_ctx,
                                                             custom_command_type=acs_custom,
                                                             min_profile='2017-03-10-profile',
                                                             resource_type=ResourceType.MGMT_ACS) # your resource type here

Where ever you have direct import statements, move them into the command or validator they are needed for and convert.
Example:

    # this
    from azure.mgmt.containerservice.models import ContainerServiceLinuxProfile
    from azure.mgmt.containerservice.models import ContainerServiceNetworkProfile

    # becomes this
    ContainerServiceLinuxProfile, ContainerServiceNetworkProfile = cmd.get_models(
        'ContainerServiceLinuxProfile', 'ContainerServiceNetworkProfile'
    )

Note you need a cmd context to call get_models so you can only do this import inside a command or validator, not as a top-level import.

[tjprescott]

cc/ @mboersma @zqingqing1 @julienstroheker