change tail tag to a less release sounding name (#1112)
change tail tag to a less release sounding name (#1112)

* change tail tag to a less release sounding name
* fix bug with detection of release tag on head
* do not use python-git to enumerate tags
* fixed bug when building without git

tst-mswartz/earthenterprise,tst-ccamp/earthenterprise,tst-ccamp/earthenterprise,tst-lsavoie/earthenterprise,tst-mswartz/earthenterprise,google/earthenterprise,tst-ppenev/earthenterprise,tst-ppenev/earthenterprise,google/earthenterprise,tst-ccamp/earthenterprise,tst-lsavoie/earthenterprise,tst-lsavoie/earthenterprise,tst-ccamp/earthenterprise,tst-mswartz/earthenterprise,tst-lsavoie/earthenterprise,google/earthenterprise,tst-eclamar/earthenterprise,tst-eclamar/earthenterprise,google/earthenterprise,tst-eclamar/earthenterprise,tst-lsavoie/earthenterprise,tst-eclamar/earthenterprise,tst-ppenev/earthenterprise,tst-ppenev/earthenterprise,tst-ppenev/earthenterprise,tst-ccamp/earthenterprise,tst-ppenev/earthenterprise,tst-ccamp/earthenterprise,tst-mswartz/earthenterprise,tst-lsavoie/earthenterprise,tst-ccamp/earthenterprise,tst-lsavoie/earthenterprise,google/earthenterprise,tst-eclamar/earthenterprise,tst-mswartz/earthenterprise,tst-ppenev/earthenterprise,tst-mswartz/earthenterprise,tst-ccamp/earthenterprise,tst-ccamp/earthenterprise,tst-eclamar/earthenterprise,tst-mswartz/earthenterprise,tst-eclamar/earthenterprise,tst-ppenev/earthenterprise,google/earthenterprise,google/earthenterprise,tst-lsavoie/earthenterprise,tst-eclamar/earthenterprise,tst-eclamar/earthenterprise,google/earthenterprise,tst-mswartz/earthenterprise,tst-ppenev/earthenterprise