Add dependency checks for Bazaar.

Review Request #12544 — Created Aug. 18, 2022 and submitted — Latest diff uploaded

chipx86
RBTools
release-4.x
rbtools

This updates BazaarClient to add formal support for dependency checks.
BazaarClient.check_dependencies() now determines if Breezy or Bazaar
is installed, and sets appropriate flags for the tool to use.

The bzr and is_breezy attributes have become properties, which will
trigger a dependency check if one is not performed. Similarly,
get_local_path() will also perform a dependency check if needed. This
is all in case of legacy usage where these are accessed before calling
setup() or has_dependencies(). In RBTools 5, these will instead
raise an exception.

Unit tests have been updated to include new dependency-related tests.
They also now leverage the dependency checks, rather than duplicating
checks or working around the different names of the tool. Tests that
require a working client will be skipped if missing a dependency.

Unit tests pass on Python 3.7 through 3.11.

Tested with Breezy installed, with Bazaar installed, and with neither
installed.

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