bitbake: toaster: don't kill all runserver processes

Toaster script kills runserver process 2 ways:
 - sending signal to pid from .toastermain.pid.
 - sending signal to pids found by grepping ps output:
       ps fux | grep "python.*manage.py runserver"

Second approach is redundant and harmfull as it kills all django
development server running on the machine.

[YOCTO #7973]

(Bitbake rev: 0f47b17fe88dc660648d94b2d8d8286d87ae6295)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/bin/toaster

@@ -33,9 +33,6 @@ webserverKillAll()
             while kill -0 $pid 2>/dev/null; do
                 kill -SIGTERM -$pid 2>/dev/null
                 sleep 1
-                # Kill processes if they are still running - may happen
-                # in interactive shells
-                ps fux | grep "python.*manage.py runserver" | awk '{print $2}' | xargs kill
             done
             rm  ${pidfile}
         fi