Remove relative imports from issue.py
Remove relative imports from issue.py

VinnieJohns/ggrc-core,AleksNeStu/ggrc-core,plamut/ggrc-core,plamut/ggrc-core,VinnieJohns/ggrc-core,AleksNeStu/ggrc-core,AleksNeStu/ggrc-core,AleksNeStu/ggrc-core,VinnieJohns/ggrc-core,VinnieJohns/ggrc-core,plamut/ggrc-core,plamut/ggrc-core