Fix problems with tag detection and PBR version setting #19
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We were seeing this:
ValueError: git history requires a target version of
pbr.version.SemanticVersion(3.9.2), but target version is
pbr.version.SemanticVersion(3.8.4)
when building networking-calico packages from a commit with multiple
version tags.
The context for that was releasing a particular patch version, 3.8.4,
so the general fix is that when we know the version we're releasing,
skip the autodetection logic and just use that version.