OS-2051 serial console login should set TERM appropriately

*** 134,144 ****
                  <propval name='modules' type='astring'
                          value='ldterm,ttcompat' />
                  <propval name='prompt' type='astring'
                          value='`uname -n` ttya login:' />
                  <propval name='terminal_type' type='astring'
!                         value='' />
          </property_group>
  </instance>
  
  <instance name='ttyb' enabled='true'>
  
--- 134,144 ----
                  <propval name='modules' type='astring'
                          value='ldterm,ttcompat' />
                  <propval name='prompt' type='astring'
                          value='`uname -n` ttya login:' />
                  <propval name='terminal_type' type='astring'
!                         value='xterm' />
          </property_group>
  </instance>
  
  <instance name='ttyb' enabled='true'>
  
*** 161,171 ****
                  <propval name='modules' type='astring'
                          value='ldterm,ttcompat' />
                  <propval name='prompt' type='astring'
                          value='`uname -n` ttyb login:' />
                  <propval name='terminal_type' type='astring'
!                         value='' />
          </property_group>
  </instance>
  
  <instance name='vt2' enabled='false'>
  
--- 161,171 ----
                  <propval name='modules' type='astring'
                          value='ldterm,ttcompat' />
                  <propval name='prompt' type='astring'
                          value='`uname -n` ttyb login:' />
                  <propval name='terminal_type' type='astring'
!                         value='xterm' />
          </property_group>
  </instance>
  
  <instance name='vt2' enabled='false'>