test-bus-marshal: use cescaping instead of hexmem
It is easier to see the contents this way by eye.
(cherry picked from commit 3ddf3d439463ab2c76391a4d22b54166be2dbe94)
Resolves: #1696224
patch_name: 0154-test-bus-marshal-use-cescaping-instead-of-hexmem.patch
present_in_specfile: true
location_in_specfile: 154
squash_commits: true