OS-2051 serial console login should set TERM appropriately

*** 1,6 ****
--- 1,24 ----
  if [ "$PS1" ]; then
+     mt_tty=$(/usr/bin/tty 2>/dev/null)
+     if [[ $mt_tty =~ ^/dev/term/[abcd] ]]; then
+         # If we're on the serial console, we generally won't know how
+         # big our terminal is.  Attempt to ask it using control sequences
+         # and resize our pty accordingly.
+         mt_output=$(/usr/lib/measure_terminal 2>/dev/null)
+         if [[ $? -eq 0 ]]; then
+             eval "$mt_output"
+         else
+             # We could not read the size, but we should set a 'sane'
+             # default as the dimensions of the previous user's terminal
+             # persist on the tty device.
+             export LINES=25
+             export COLUMNS=80
+         fi
+         /usr/bin/stty rows ${LINES} columns ${COLUMNS} 2>/dev/null
+     fi
+     unset mt_output mt_tty
      shopt -s checkwinsize
      if [[ -f /.dcinfo ]]; then
          . /.dcinfo
          DC_NAME="${SDC_DATACENTER_NAME}"
          DC_HEADNODE_ID="${SDC_DATACENTER_HEADNODE_ID}"