Install/Uninstall isn't working correctly with more then one disable-features flags

[Vad1mo]

1. When installing RIO with --disable-features
   This syntax with comma as described in the help isn't working: --disable-features linkerd, letsencrypt

NAME:
   rio install - Install rio management plane

USAGE:
   rio install [OPTIONS]

OPTIONS:
   --check                   Only check status, don't deploy controller
   --disable-features value  Manually specify features to disable, supports comma separated 

2. Rio uninstall is also uninstalling linkerd that wasn't installed with rio:
   After installing rio with --disable-features linkerd --disable-features letsencrypt and then uninstalling rio, rio is also uninstalled linkerd that wasn't install with rio.