Cloud-init analyzeand devel commandline traceback

Calling cloud-init analyze from the command line results in a traceback due to the argument parser not properly setting up subparser default behavior.

$ cloud-init devel
Traceback (most recent call last):
  File "/usr/bin/cloud-init", line 9, in <module>
    load_entry_point('cloud-init==0.7.9', 'console_scripts', 'cloud-init')()
  File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 784, in main
    (name, functor) = args.action
AttributeError: 'Namespace' object has no attribute 'action'

$ cloud-init analyze

# But direct python module calls work

$ python3 -m cloudinit.cmd.main devel
usage: /usr/lib/python3/dist-packages/cloudinit/cmd/main.py analyze
       [-h] {blame,show,dump} ...
/usr/lib/python3/dist-packages/cloudinit/cmd/main.py analyze: error: the following arguments are required: subcommand

$ python3 -m cloudinit.cmd.main analyze
usage: /usr/lib/python3/dist-packages/cloudinit/cmd/main.py analyze
       [-h] {blame,show,dump} ...
/usr/lib/python3/dist-packages/cloudinit/cmd/main.py analyze: error: the following arguments are required: subcommand