acu170189 move cloud_metadata_generation_command to Cloud class
acu170189 update azure ohai plugin to use SharedConfig.xml on linux for node attributes
acu170189 add SharedConfig.xml reading specs
acu170189 - refactor azure plugin, to fetch data from dhcp server
acu170189 - move duplicated logic into helper module
acu170189 - add winrm port discovering for azure ohai chef plugin
acu170189 - fix typo
Merge pull request #459 from rightscale/ivory_14_14_acu170189_azure_and_dedup

Update azure ohai plugin to use SharedConfig.xml on linux for node attributes.