jiri-v23-profiles: Use relative paths everywhere in profile manifests.

This CL:

* Gets rid of the SchemaVersion check when setting InstallationDir.  We
  now assume a schema version > 4.

* Uses relpath.RelativePath() for profile installation dirs.  (Some were
  using .String()).

* Uses relpath.String() for all environment variables.  (Some were using
  .Expand()).

* Minor fixes to RelativePath comments, and fix typo in signature.

MultiPart: 2/2
Change-Id: Ia877a2dd6e282024c8dc2a862fa0e24a3b407ea2
1 file changed