Created attachment 1343111 [details]
disconnected terminal

Description of problem:
The terminal content in the web console is not cleared properly, when user re-connects the session using the "refresh" gray button in the upper right corner of the terminal. Once re-connected, user is typing "over" the old content from the previous session.

Version-Release number of selected component (if applicable):
This was induced on the starter-ca-central OSO cluster w/ Mozilla Firefox 56.0
OpenShift Master:
    v3.7.0-0.143.7 (online version 3.6.0.32.1)
Kubernetes Master:
    v1.7.0+80709908fd 

How reproducible:
Consistently reproducible

Steps to Reproduce:
1. Navigate to the Terminal tab of a running pod
2. Run a few commands
3. Disconnect the terminal by pressing Ctrl+D or using "exit"
4. Reconnect the terminal without navigating away, by clicking the grey "refresh" button in the upper right corner of the disconnected terminal.

Actual results:
The terminal is re-connected, the cursor and prompt is rendered on the first line (effectively deleting only the first line of the old content), over the old content from the previous session.

Expected results:
The old content is to be cleared and the prompt is to be rendered in a blank terminal.

Additional info:
See attached screenshots