Revert "include selectors2 in requirements"
Revert "include selectors2 in requirements"

This reverts commit 0400b0229e0516c7ec59f1a48b9970e4c2fbebb2.

nwautomator/ncclient,earies/ncclient,vnitinv/ncclient,ncclient/ncclient,einarnn/ncclient,leopoul/ncclient