vlib: restore commands for non-interactive sessions
vlib: restore commands for non-interactive sessions

'quit' and 'show terminal' are valid for non-interactive sessions too.

Type: fix
Fixes: a58be82dda89d6496f92e451b42eee31f0cf47b4

Change-Id: Ib63244c7b64ad2e30c257ed19e982295f59bfffa
Signed-off-by: Benoît Ganne <38aad8ffcfa407b890d258e568f161530f66882d@cisco.com>

FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp