The additional sed removes every line after seeing the first line starting with a #, just like git will do it later as well. See: http://article.gmane.org/gmane.comp.documentfoundation.libreoffice.devel/26794
This a a prep-work for if and when we use gerrit it is very important to call gerrit's commit-msg hook and the sooner we teach our own hook to play nice with it the less likely we will have issue during migration
