This switches all arm related tests (32bit and 64bit) to the aarch64
systems Travis provides. For arm32 we are running in a armv7hf container
on aarch64 with 'setarch linux32'.
The main changes are that docker on Travis aarch64 cannot use
'--privileged' as Travis is using unprivileged LXD containers to setup
the testing environment.
Signed-off-by: Adrian Reber <areber@redhat.com>
