toolchanger test:  make race condition less likely by increasing sleep

There's a race condition in the linuxcncrsh tests that's been dealt
with before by sleeping a second before comparing test output to
expected output.

This occasionally bites my buildbot, so hack it more by increasing the
sleep to five seconds.

The following example output shows the last several lines of
'gcode-output' truncated; the file is complete upon later inspection:

shutdown
+ wait
+ exit 0
--- expected-gcode-output	2014-01-29 17:54:34.000000000 -0600
+++ gcode-output		2014-01-29 18:44:02.666945642 -0600
@@ -209,9 +209,3 @@
 tlo_z = -0.400000

 sequence number 30.000000
-X = 0.000000
-Y = 0.000000
-Z = 0.400000
-toolno = 99999.000000
-tlo_z = -0.400000
-
*** [...]/tests/toolchanger/toolno-pocket-differ/nonrandom: \
    FAIL: checkresult exited with 1
FIXME:  temp. don't kill realtime.in to debug a msgd hang

Instead get a gdb back trace and then hang forever.