azure dhclient-hook cleanups
This adds some function to the generator to maintain the presense of a flag file '/run/cloud-init/enabled' indicating that cloud-init is enabled. Then, only run the dhclient hooks if on Azure and cloud-init is enabled. The test for is_azure currently only checks to see that the board vendor is Microsoft, not actually that we are on azure. Running should not be harmful anywhere, other than slowing down dhclient. The value of this additional code is that then dhclient having run does not task the system with the load of cloud-init. Additionally, some changes to config are done here. * rename 'dhclient_leases' to 'dhclient_lease_file' * move that to the datasource config (datasource/Azure/dhclient_lease_file) Also, it removes the config in config/cloud.cfg that set agent_command to __builtin__. This means that by default cloud-init still needs the agent installed. The suggested follow-on improvement is to use __builtin__ if there is no walinux-agent installed.
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