Add gitlint check to automation (SOC-9559)

The SUSE-Cloud/automation repo is our backbone for storing everything CI and
Release Engineering related. As this is such a critical piece we have to make
sure whatever is merged there is tracked, agreed and well documented. By using
the existing gitlint config we make a first step towards this direction.

Makefile

@@ -1,5 +1,5 @@
 SHELL := /bin/bash
-test: filecheck bashate perlcheck rubycheck pythoncheck rounduptest flake8 python_unittest jjb_test
+test: filecheck bashate perlcheck rubycheck pythoncheck rounduptest flake8 python_unittest jjb_test gitlint
 
 clean:
 	rm -f scripts/jenkins/jenkins-job-triggerc scripts/lib/libvirt/{net-configc,vm-startc,compute-configc,net-startc,admin-configc,cleanupc}
@@ -76,6 +76,9 @@ cisd_deploy: gerrit-project-regexp
 cioo_deploy:
 	jenkins-jobs --conf /etc/jenkins_jobs/jenkins_jobs-cioo.ini update jenkins/ci.opensuse.org:jenkins/ci.opensuse.org/templates/ openstack*
 
+gitlint:
+	gitlint --commits master..HEAD -C scripts/jenkins/gitlint.ini
+
 # for travis-CI:
 install: debianinstall genericinstall
 
@@ -87,8 +90,8 @@ suseinstall:
 	sudo zypper install perl-JSON-XS perl-libxml-perl perl-libwww-perl python-pip python3-pip libvirt-python python3-libvirt-python
 
 genericinstall:
-	sudo pip2 install -U 'pbr>=2.0.0,!=2.1.0' bashate 'flake8<3.0.0' flake8-import-order jenkins-job-builder requests
-	sudo pip3 install -U 'pbr>=2.0.0,!=2.1.0' bashate 'flake8<3.0.0' flake8-import-order jenkins-job-builder requests
+	sudo pip2 install -U 'pbr>=2.0.0,!=2.1.0' bashate 'flake8<3.0.0' flake8-import-order jenkins-job-builder requests gitlint
+	sudo pip3 install -U 'pbr>=2.0.0,!=2.1.0' bashate 'flake8<3.0.0' flake8-import-order jenkins-job-builder requests gitlint
 	git clone https://github.com/SUSE-Cloud/roundup && \
 	cd roundup && \
 	./configure && \