Fusesoc gets stuck when I add core with version that has `-dev` appendix

[rbrglez]

Example of VLNV that causes fusesoc to get stuck in infinite loop: `open-logic:open-logic:base:3.2.0-dev

How to reproduce fusesoc getting stuck:

• Download this testing repository: https://github.com/rbrglez/testing-fusesoc-versioning
• run following bash scripts, which are just fusesoc wrappers:

./init_development_olo_3.2.0-dev.sh
./init_test_target_core.sh
./run_base_test_target.sh

Check out this issue, why it would be useful that fusesoc would support -dev appendix in version part of VLNV. https://github.com/open-logic/open-logic/issues/109