tools: Remove bashisms from the quick start devel scripts

Michael Ellerman noticed we weren't using shebangs in those scripts. I
shrugged it off too quickly in the review, because it worked after all.
Turned out to be a bashmism, along with the usage of 'source'.

With those fixed, we have a better chance to run on most shells (famous
last words). Tested it with bash and dash.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

tools/run-devel.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 # Patchwork - automated patch tracking system
 # Copyright (C) 2015 Intel Corporation
 #

tools/setup-devel.sh

@@ -1,3 +1,4 @@
+#!/bin/sh
 # Patchwork - automated patch tracking system
 # Copyright (C) 2015 Intel Corporation
 #
@@ -26,7 +27,7 @@ update_virtualenv()
     requirements=$2
 
     [ -d "$directory" ] || virtualenv "$directory"
-    source $directory/bin/activate
+    . $directory/bin/activate
     pip install --upgrade -r $requirements
 }