Add tool to migrate files from tempest into lib
Add tool to migrate files from tempest into lib

This commit adds a new tool to migrate files with history into
tempest-lib. When migrating functionality into tempest we need to
use this instead of copying and pasting files so that we preserve the
commit history from tempest.

mtreinish/tempest-lib,varunarya10/tempest-lib,sorenh/tempest-lib,afaheem88/tempest-lib,JioCloud/tempest-lib,cneill/tempest-lib