stage1: flavor src: print systemd version with git-describe
stage1: flavor src: print systemd version with git-describe

When a test fails because of systemd, it is useful to know which version
of systemd was used exactly. But this information is not always known:
when stage1 is build with systemd from git-master, we don't know exactly
which commit was used for the build because git-master moves often.

Write the git version both in the build logs (useful for continuous
integration) and in stage1.aci.

Unfortunately, git-describe does not always work well on repository
cloned with --depth so I am removing the --depth optimization.

kinvolk/rkt,Yhgenomics/rkt,akshaykarle/rkt,MattDees/rkt,sstabellini/rkt,iankronquist/rkt,Wilybald/rkt,Shashwatsh/rkt,tv42/rkt,intfrr/rkt,rkt/rkt,smarvin/rkt,s-urbaniak/rkt,tixxdz/rkt,blixtra/rkt,jonboulle/rkt,matthaias/rkt,crawford/rkt,squaremo/rkt,akshaykarle/rkt,markllama/rkt,shobhit85/rkt,dgonyeo/rkt,achanda/rkt,kinvolk/rkt,shobhit85/rkt,intelsdi-x/rkt,rhvgoyal/rkt,linki/rkt,lucasallan/rkt,smarvin/rkt,cab105/rkt,jasonchaffee/rkt,maquanyi/rkt,cab105/rkt,akshaykarle/rkt,iaguis/rkt,il9ue/rkt,mike1729/rkt,rot26/rkt,kinvolk/rkt,intfrr/rkt,il9ue/rkt,wparad/rkt,monstermunchkin/rkt,alban/rkt,lee212/rkt,tv42/rkt,yifan-gu/rocket,MattDees/rkt,sgotti/rkt,maquanyi/rkt,Shashwatsh/rkt,kbrwn/rkt,markllama/rkt,liubq919/rkt,squeed/rkt,squaremo/rkt,tmrts/rkt,bsmr-go/rkt,sinfomicien/rkt,markllama/rkt,euank/rkt,mike1729/rkt,lee212/rkt,intelsdi-x/rkt,nhlfr/rkt,dalanlan/rkt,tmrts/rkt,joshix/rkt,jakon89/rkt,achanda/rkt,liugenping/rkt,linki/rkt,rkt/rkt,luebken/rkt,krnowak/rkt,iankronquist/rkt,fdserr/rkt,s-urbaniak/rkt,matthaias/rkt,lucasallan/rkt,lee212/rkt,kbrwn/rkt,sinfomicien/rkt,adfernandes/rkt,Yhgenomics/rkt,dalanlan/rkt,ybubnov/rkt,michelangelo13/rkt,jzelinskie/rkt,marineam/rkt,Wilybald/rkt,mjg59/rkt,endocode/rkt,crawford/rkt,ChengTiesheng/rkt,intelsdi-x/rkt,sstabellini/rkt,wparad/rkt,jjlakis/rkt,sgotti/rkt,krnowak/rkt,endocode/rkt,mjg59/rkt,lucasallan/rkt,mike1729/rkt,dalanlan/rkt,maquanyi/rkt,coreos/rkt,bsmr-go/rkt,rhvgoyal/rkt,jasonchaffee/rkt,sinfomicien/rkt,liugenping/rkt,euank/rkt,squaremo/rkt,ChengTiesheng/rkt,marineam/rkt,rhvgoyal/rkt,rkt/rkt,blixtra/rkt,alexhersh/rkt,ChengTiesheng/rkt,smarvin/rkt,jjlakis/rkt,joshix/rkt,liubq919/rkt,Wilybald/rkt,yifan-gu/rocket,shobhit85/rkt,jonboulle/rkt,jzelinskie/rkt,squeed/rkt,marineam/rkt,jjlakis/rkt,adfernandes/rkt,yifan-gu/rkt,liubq919/rkt,iankronquist/rkt,coreos/rkt,tixxdz/rkt,krnowak/rkt,dgonyeo/rkt,jonboulle/rkt,fdserr/rkt,Yhgenomics/rkt,liugenping/rkt,adfernandes/rkt,coreos/rkt,rot26/rkt,chrisseto/rkt,alexhersh/rkt,MattDees/rkt,michelangelo13/rkt,achanda/rkt,lucasallan/rkt,fdserr/rkt,endocode/rkt,alban/rkt,sgotti/rkt,tmrts/rkt,cab105/rkt,linki/rkt,joshix/rkt,il9ue/rkt,alexhersh/rkt,Wilybald/rkt,dgonyeo/rkt,rkt/rkt,nhlfr/rkt,rot26/rkt,ybubnov/rkt,matthaias/rkt,Shashwatsh/rkt,s-urbaniak/rkt,alban/rkt,euank/rkt,monstermunchkin/rkt,squeed/rkt,michelangelo13/rkt,luebken/rkt,tixxdz/rkt,tv42/rkt,luebken/rkt,mjg59/rkt,kbrwn/rkt,jakon89/rkt,chrisseto/rkt,iaguis/rkt,jzelinskie/rkt,sstabellini/rkt,jasonchaffee/rkt,wparad/rkt,blixtra/rkt,nhlfr/rkt,monstermunchkin/rkt,bsmr-go/rkt,kinvolk/rkt,chrisseto/rkt,yifan-gu/rkt,intfrr/rkt,yifan-gu/rocket,joshix/rkt,jakon89/rkt,crawford/rkt,iaguis/rkt,yifan-gu/rkt,ybubnov/rkt