[gnome-continuous-yocto/gnomeostree-3.28-rocko: 5911/8267] selftest/devtool: change write to append config in virtual_kernel_modify

[Emmanuele Bassi <ebassi src gnome org>]

commit 3266238516fd1214d97b7f606733cbfe655779fd
Author: Aníbal Limón <anibal limon linux intel com>
Date:   Mon May 1 12:11:23 2017 -0500

    selftest/devtool: change write to append config in virtual_kernel_modify
    
    When uses write it creates a full new configuration in selftest.inc
    causing to fail populate_sdk_ext linux-yocto because the signature
    of the sstate changes.
    
    [YOCTO #11300]
    
    (From OE-Core rev: 65bab9210be51aeb431ea85c90e31ad9f0d2340c)
    
    Signed-off-by: Aníbal Limón <anibal limon linux intel com>
    Signed-off-by: Ross Burton <ross burton intel com>
    Signed-off-by: Richard Purdie <richard purdie linuxfoundation org>

 meta/lib/oeqa/selftest/devtool.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/meta/lib/oeqa/selftest/devtool.py b/meta/lib/oeqa/selftest/devtool.py
index 5704866..39f3543 100644
--- a/meta/lib/oeqa/selftest/devtool.py
+++ b/meta/lib/oeqa/selftest/devtool.py
@@ -1635,7 +1635,7 @@ class DevtoolTests(DevtoolBase):
         #Set machine to qemxu86 to be able to modify the kernel and
         #verify the modification.
         features = 'MACHINE = "qemux86"\n'
-        self.write_config(features)
+        self.append_config(features)
         kernel_provider = get_bb_var('PREFERRED_PROVIDER_virtual/kernel')
         # Clean up the enviroment
         bitbake('%s -c clean' % kernel_provider)