Change ipmi console closure to only close SOL

Previously, was pulling the cord on a perfectly servicable IPMI
session object.  Change to just deactivating the SOL portion
of an IPMI connection if the console closes.

TODO

@@ -28,9 +28,8 @@ KeyError: ''
 -have pyghmi and friends do multiprocessing pools
 -investigate console behavior when target off (causing disconnects/reconnects
  on input)
--with logging set to interactive or none, repeatedly connect to an ipmi
- console that is actively outputting data.  It seems that some race condition
- causes creation of an ipmi console to result in a hung up console
+-test to make sure that 'Session Disconnected' is working
 -confetty to do right thing with respect to status updates when run right on a
  console.  It currently clutters up the screen with data that would land in
- a titlebar
+ a titlebar
+-audit log did not show confetty activity for starting console

plugins/hardwaremanagement/ipmi.py

@@ -150,7 +150,7 @@ class IpmiConsole(conapi.Console):
         if self.solconnection is not None:
             # break the circular reference here
             self.solconnection.out_handler = _donothing
-            self.solconnection.ipmi_session.logout()
+            self.solconnection.close()
         self.solconnection = None
         self.broken = True
         self.error = "closed"