New script utils/build-srpm.sh to build SRPM

This script gets version and release from git describe --tags. It uses
utils/ansible-freeipa.spec.in and the variables to generate
ansible-freeipa.spec in the top folder.

An archive not including the spec file is created to generate the SRPM from.

utils/build-srpm.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+git_version=$(git describe --tags | sed -e "s/^v//")
+version=${git_version%%-*}
+release=${git_version#*-}
+release=${release//-/_}
+
+date=$(date "+%a %b %e %Y")
+topdir=$(dirname $0)
+
+sed -e "s/@@VERSION@@/$version/g" -e "s/@@RELEASE@@/$release/g" -e "s/@@DATE@@/$date/g" $topdir/ansible-freeipa.spec.in > ansible-freeipa.spec
+
+git archive --format=tar --prefix=ansible-freeipa-${version}-${release}/ 'HEAD' | bzip2 -c > ansible-freeipa-${version}-${release}.tar.bz2
+
+rpmbuild --define "_sourcedir $PWD" -bs ansible-freeipa.spec