preindex: don't hard-code a 'v1' prefix
preindex: don't hard-code a 'v1' prefix

This task is using a different regex to the local one, and this one has
a hard-coded 'v1' prefix in it. This does not mix well with releasing
version 2.0 of git.

Copy the regex from local_index which removes the version number assumption.

This fixes #411.

Xia-lj/git-scm.com,mjhasbach/git-scm.com,dscho/git-scm.com,jasonlong/git-scm.com,empyrical/git-scm.com,beni55/git-scm.com,xyztest/git-scm.com,git/git-scm.com,dscho/git-scm.com,Croydon/git-scm.com,empyrical/git-scm.com,eyecatchup/git-scm.com,initaldk/git-scm.com,openhardnudd/git-scm.com,jasonlong/git-scm.com,gittower/git-scm.com,jnavila/gitscm-next,gittower/git-scm.com,Croydon/git-scm.com,dotty2883/git-scm.com,pwz3n0/git-scm.com,pwz3n0/git-scm.com,openhardnudd/git-scm.com,jnavila/gitscm-next,Mokolea/git-scm.com,jnavila/gitscm-next,xyztest/git-scm.com,Belthazor2008/git-scm.com,mahyoub/git-scm.com,eyecatchup/git-scm.com,Xia-lj/git-scm.com,xyztest/git-scm.com,pwz3n0/git-scm.com,beni55/git-scm.com,gittower/git-scm.com,mosoft521/gitscm-next,Belthazor2008/git-scm.com,initaldk/git-scm.com,git/git-scm.com,peterkinalex/git-scm.com,virgo075/git-scm.com,Croydon/git-scm.com,openhardnudd/git-scm.com,Croydon/git-scm.com,ThiagoGarciaAlves/git-scm.com,mosoft521/gitscm-next,DAKaufman/git-scm.com,mahyoub/git-scm.com,jasonlong/git-scm.com,beni55/git-scm.com,dotty2883/git-scm.com,eyecatchup/git-scm.com,Xia-lj/git-scm.com,Mokolea/git-scm.com,MjAbuz/git-scm.com,DAKaufman/git-scm.com,Mokolea/git-scm.com,MjAbuz/git-scm.com,dscho/git-scm.com,initaldk/git-scm.com,mosoft521/gitscm-next,git/git-scm.com,eyecatchup/git-scm.com,xyztest/git-scm.com,ThiagoGarciaAlves/git-scm.com,virgo075/git-scm.com,mjhasbach/git-scm.com,mjhasbach/git-scm.com,Belthazor2008/git-scm.com,Mokolea/git-scm.com,Belthazor2008/git-scm.com,empyrical/git-scm.com,gittower/git-scm.com,initaldk/git-scm.com,empyrical/git-scm.com,peterkinalex/git-scm.com,jasonlong/git-scm.com,mahyoub/git-scm.com,dscho/git-scm.com,peterkinalex/git-scm.com,virgo075/git-scm.com,peterkinalex/git-scm.com,git/git-scm.com,DAKaufman/git-scm.com,openhardnudd/git-scm.com,mahyoub/git-scm.com,Xia-lj/git-scm.com,virgo075/git-scm.com,dotty2883/git-scm.com,ThiagoGarciaAlves/git-scm.com,ThiagoGarciaAlves/git-scm.com,mosoft521/gitscm-next,DAKaufman/git-scm.com,MjAbuz/git-scm.com,dotty2883/git-scm.com,MjAbuz/git-scm.com,jnavila/gitscm-next,beni55/git-scm.com,pwz3n0/git-scm.com,mjhasbach/git-scm.com