new: FreeBSD module to support cloud-init on the FBSD10 platform. In its
current form its still missing some modules though.

Supported:
-SSH-keys
-growpart
-growfs
-adduser
-powerstate
fix: Fallback to check the interface state, specifically freebsd benefits
of this.
fix: Log the used method as well.
change: Separate functions to load, read and write /etc/rc.conf keys and
values. Use these right away to read and change the hostname.
change: Use util.system_info().
new: Touch a reboot-required file to make clear we want a reboot after
resizing the partition.
change: Use util.system_info().
change: Use a proper signal instead of 'just' 0.
fix: Proper comment.
change: Just run the required command and let the exception do the rest
if the process died. Checking first if the process is still alive proofed
to be quite error prone, atleast on a rather slow compute node.
new: Apply the locale to the default login class.
Significant re-working of the userdata handling and introduction of
vendordata.

Vendordata is a datasource provided userdata-like blob that is parsed
similiarly to userdata, execept at the user's pleasure.


cloudinit/config/cc_scripts_vendor.py: added vendor script cloud config

cloudinit/config/cc_vendor_scripts_per_boot.py: added vendor per boot
    cloud config

cloudinit/config/cc_vendor_scripts_per_instance.py: added vendor per
    instance vendor cloud config

cloudinit/config/cc_vendor_scripts_per_once.py: added per once vendor
    cloud config script

doc/examples/cloud-config-vendor-data.txt: documentation of vendor-data
    examples

doc/vendordata.txt: documentation of vendordata for vendors

(RENAMED) tests/unittests/test_userdata.py => tests/unittests/test_userdata.py
      TO: tests/unittests/test_userdata.py => tests/unittests/test_data.py:
    userdata test cases are not expanded to confirm superiority over vendor
    data.

bin/cloud-init: change instances of 'consume_userdata' to 'consume_data'

cloudinit/handlers/cloud_config.py: Added vendor script handling to default
    cloud-config modules

cloudinit/handlers/shell_script.py: Added ability to change the path key to
    support vendor provided 'vendor-scripts'. Defaults to 'script'.

cloudinit/helpers.py:
    - Changed ConfigMerger to include handling of vendordata.
    - Changed helpers to include paths for vendordata.

cloudinit/sources/__init__.py: Added functions for helping vendordata
    - get_vendordata_raw(): returns vendordata unprocessed
    - get_vendordata(): returns vendordata through userdata processor
    - has_vendordata(): indicator if vendordata is present
    - consume_vendordata(): datasource directive for indicating explict
        user approval of vendordata consumption. Defaults to 'false'

cloudinit/stages.py: Re-jiggered for handling of vendordata
    - _initial_subdirs(): added vendor script definition
    - update(): added self._store_vendordata()
    - [ADDED] _store_vendordata(): store vendordata
    - _get_default_handlers(): modified to allow for filtering
        which handlers will run against vendordata
    - [ADDED] _do_handlers(): moved logic from consume_userdata
        to _do_handlers(). This allows _consume_vendordata() and
        _consume_userdata() to use the same code path.
    - [RENAMED] consume_userdata() to _consume_userdata()
    - [ADDED] _consume_vendordata() for handling vendordata
        - run after userdata to get user cloud-config
        - uses ConfigMerger to get the configuration from the
            instance perspective about whether or not to use
            vendordata
    - [ADDED] consume_data() to call _consume_{user,vendor}data

cloudinit/util.py:
    - [ADDED] get_nested_option_as_list() used by cc_vendor* for
        getting a nested value from a dict and returned as a list
    - runparts(): added 'exe_prefix' for running exe with a prefix,
        used by cc_vendor*

config/cloud.cfg: Added vendor script execution as default

tests/unittests/test_runs/test_merge_run.py: changed consume_userdata() to
    consume_data()

tests/unittests/test_runs/test_simple_run.py: changed consume_userdata() to
    consume_data()
Merge with upstream sources
Added vendordata to SmartOS
Allow a Config Drive source on a partition, if the label matches.
Bring back the ec2 utils, non-boto userdata/metadata reading

This replacement uses our own userdata/metadata ec2 webservice
parser that we can easily modify, it also automatically allows
for reading the ec2 userdata/metdata from files and also brings
in the usage of requests instead of boto's usage of urllib which
did not support ssl properly.
Add ec2 utils tests and httpretty requirement for http mocking
Add a maybe_json helper function
Only check for json objects instead of also arrays
Updated non-json message