This commit adds an extra step to generate-all:
- if --updateSpec flag is specified, FileTreeSpec of the generated vendor module is written out
to vendor-specs/$VENDOR/$DEVICE.yaml file ("reference FileTreeSpec").
- if --updateSpec is not specified, FileTreeSpec of the generated vendor module is compared against
the reference FileTreeSpec. If there are any differences, generated vendor module is deleted and an
exception is thrown.
Also, when --updateSpec flag is used, text files inside vendor module are written out to
vendor-skels/$VENDOR/$DEVICE directory.
Contents of vendor-skels/ are useful for keeping track of vendor module changes via git and for
showing diffs in case text files in the generated module don't match the reference ones.
