Add a 'git_import_svn_tags' function to .indt

When using git-svn to manipulate a svn repo
through git tool, the SVN tags are not automatically
imported as GIT tags, instead, the svn tagas are
initially git remote branches

This functions tranforms those svn tags in actual
git tags

Signed-off-by: Nick Diego Yamane <nick.yamane@openbossa.org>