buildstream-1.1.2-bp156.3.1

- Update to version 1.1.2:
  + New ref-storage option allows one to store source refs, such as
    git shas, in one central project.refs file instead of inline
    with the source declarations.
  + Deprecated `--track-save` optionality in `bst build`, this does
    not make sense to support now that there is project.refs.
  + Added the `sandbox` configuration option which can be used in
    `project.conf` and elements, to control the user ID and group
    ID used in build sandboxes.
  + Added new `deb` source implementation, for staging of
    downloaded deb package files.

- Update to version 1.1.1:
  + New project configuration controlling how the sandbox behaves
    when `bst shell` is used; allowing projects to provide a more
    functional shell environment.
  + The `bst shell` command now has a `--mount` option allowing
    users to mount files and directories into the sandbox for
    testing purposes.
  + Log lines are now configurable with the new "message-format"
    user configuration, allowing one to express optional fields
    such as microsecond precision and wallclock time.
  + Newly added filter element
  + Git source plugin now allows disabling of submodule checkouts
  + In the same way we allow overriding element configurations
    by their 'kind' in project.conf, we now support the same
    for source plugin configurations.
  + Tar and zip sources now automatically recall an `etag`
    from the http headers, optimizing tracking of tarballs
    significantly (glgo#GNOME/BuildStream#62).

- Update to version 1.1.0:
  + Multiple artifact caches are now supported in project and
    user configuration with a priority order
    (gl#BuildStream/buildstream#85).
  + Add junction support for subprojects.
  + Changes towards incremental builds in workspaces.
  + `bst shell --build` now creates true build sandbox.
  + Many bug fixes.

- Initial openSUSE package, version 1.0.1.