detect changelog footers

it is expected to be a [ChangeLog] tag, not a ChangeLog footer.

Change-Id: Iaf5bb09976ecfbd4d7cbde9eaf303f682aa14f58
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
ignore symlinks

otherwise we complain about the missing newline at the end, which is
pointless (arguably, git is being stupid here in the first place, but
whatever).

Change-Id: I51bc49825c2a74b26691927660a6771a3925af7d
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>