Last tags don't filter current branch

[maciejwajda]

Last tags don't filter on current branch but use all branches tags, equivalent of git tag instead of git tag --merged.
This can be fixed here net.nemerosa.versioning.git.GitInfoService#getLastTags
e.g.

    List<String> getLastTags(Project project, VersioningExtension extension, String tagPattern) {
        // Git access
        //noinspection GroovyAssignabilityCheck
        def grgit = Grgit.open(currentDir: getGitDirectory(extension, project))
        def branchCommits = grgit.log(maxCommits: 10000)*.id
        // List all tags
        return grgit.tag.list()
        // ... filters using the pattern and commits from current branch
                .findAll { (it.name =~ tagPattern).find() && branchCommits.contains(it.commit.id) }
                .sort{ a,b ->
        // ... sort by desc commit time
                    b.commit.dateTime.toEpochSecond() <=> a.commit.dateTime.toEpochSecond() ?:
        // ... (#36) commit time is not enough. We have also to consider the case where several pattern compliant tags
        // ...       are on the same commit, and we must sort them by desc version
                    TagSupport.tagOrder(tagPattern, b.name) <=> TagSupport.tagOrder(tagPattern, a.name)
        // ... gets their name only
                }*.name
    }