Obs-img-utils

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- Do not raise if image metadata not found unless conditions are provided
- Cleanup tests and rename setup method
- Update readthedocs config file

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- Adds new required extension (vmdk.xz) for images
- In case base_name variable is not set, the highest version-release combination of matching images in OBS is chosen.

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- Adds .vhdfixed extension support for images
- Supports new Open Build Service web interface
- Includes an --output parameter to packages subcommand to select output format
- Improvements in log verbosity control parameters (--quiet and --verbose)

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- Set conditions to empty list if no conditions
- Simplify the filter defaults using or condition

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- Move mkpath call to the init method
- Use a consistent return type of tuple in fetch_file_name function

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- Only check conditions if there are conditions to check
- Only download image metadata file if conditions exist or packages
variable accessed
- Make packages a separate lazy variable so conditions methods can
be called separately
- Pull base file name from image name instead of requiring image
metadata file
- Make image version and release lazy properties instead of
dictionary keys
- Checksum validation can be skipped
- Remove image_status dictionary and move remaining keys to
instance variables
- Add check_all_conditions convenience method
- Add a function to fetch file name from download server based
on regex match