Use pmbootstrap_v3.cfg as config file
Using pmbootstrap v3 with the old config can cause problems, for example when having $WORK in the pmaports dir instead of the actual work path. This is not supported anymore by v3 to reduce complexity. The format of how mirrors are stored in the config also has changed.
Use a separate config file, so users can go back from v3 to 2.3.x if they need to (for figuring out a regression) and so users won't run into bugs when moving from 2.3.x to v3.
Close #2390 (closed)
Edited by Administrator