- Support getting the container tags from the Dockerfile

- Put the disturl in the .buildenv file
- Support rpm-buildroot-override buildflag
- Support kvm builds on Debian
- Support with/without/unless rich deps
- Added obs-docker-support script for docker images
- Initial SLE 15 config

OBS-URL: https://build.opensuse.org/package/show/openSUSE:Tools/build?expand=0&rev=332

build.spec

@@ -22,7 +22,7 @@ Name:           build
 Summary:        A Script to Build SUSE Linux RPMs
 License:        GPL-2.0+ and GPL-2.0
 Group:          Development/Tools/Building
-Version:        20171012
+Version:        20171023
 Release:        0
 Source:         obs-build-%{version}.tar.gz
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build