Add bash completion for global `--context|-c` option
Add bash completion for global `--context|-c` option

Signed-off-by: Harald Albers <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@albersweb.de>

thaJeztah/cli,cpuguy83/cli,docker/cli,cpuguy83/cli,docker/cli,thaJeztah/cli