It fails with master of poky and I created the following ticket to
track it https://bugzilla.yoctoproject.org/show_bug.cgi?id=11907.
I don't think we have ever used the ptest to run tests on the device
so let's just disable it and compile more quickly.
Create a Makefile that does the lifting of setting up the config
as it is done on the system. Handles the creation of the .ssh/config
for upload.
In the past upstream poned on such master Makefiles but as we
customize our build environment quite a bit it probably makes
sense and reduces the clone+set-up to two calls.