ioutil has been deprecated since golang 1.16.
This commit uses the replacement methods from the os or io packages.
This should fix some golangci-lint CI failures.
Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
Also:
- Introduce cleanup mechanism for unexpose
- Minor enhancement to bastion/forwarder to support tunnel only operation
Signed-off-by: Jason T. Greene <jason.greene@redhat.com>