Retire vexpress-qemu client build and integration testing
Retire vexpress-qemu client build and integration testing

No currently supported Yocto branch (sumo, rocko, thud) is missing x86
support, so they all can use the x86 client for testing.

This saves a considerable amount of build and test time.

Also the resulting Pipeline gets simplified. Most notibly the now
renamed "build_client" and "test_integration" jobs have hardcoded
configuration to build/test x86-64 client only.

Changelog: None

Signed-off-by: Lluis Campos <9244cb41c39addfc5cf236920b776ea2820513d0@northern.tech>

mendersoftware/meta-mender-qemu