Tests for https://github.com/seL4/seL4/issues/941

[midnightveil]

Depends on #123, which is merged in this branch.

Per seL4/seL4#941 (comment)

SchedContext_Bind on a TCB can give a task budget to run on another core.
    SCHED_CONTEXT_SMP_001
SchedContext_Bind on a signalled NF bound to a TCB can give a task budget to run on another core.
    SCHED_CONTEXT_SMP_003 but impossible due to https://github.com/seL4/seL4/issues/1617
SchedControl_Configure can migrate a task's SC to a different core (either the current task or another one).
    SCHED0022, every single test that calls set_helper_affinity
SchedControl_Configure can update a remote task's SC to have budget to run immediately.
    SCHED_CONTEXT_SMP_004
seL4_TCB_SetPriority can increase a remote task's priority.
    SCHED0023
A suspended remote task can be resumed.
    SCHED0024
seL4_SchedContext_YieldTo can give budget to a remote task.
    SCHED0025
A blocking remote task can be activated by a signal.
    SCHED_CONTEXT_SMP_005 (and many other tests)
A blocking remote task can be activated by a call.
    SCHED_CONTEXT_SMP_005 (and many other tests)
A blocking remote task can be activated by a reply.
    SCHED_CONTEXT_SMP_005 (and many other tests)
A blocking passive remote task can be activated by a signal, triggering core migration for the TCB.
    SCHED_CONTEXT_SMP_006/SCHED_CONTEXT_SMP_006/SCHED_CONTEXT_SMP_008
A blocking passive remote task can be activated by a call, triggering core migration for the TCB.
    IPC0028

seL4_SchedContext_Unbind and seL4_SchedContext_UnbindObject can take away a remote task's SC.
    SCHED_CONTEXT_SMP_010
SchedControl_Configure can migrate a remote task.
    SCHED0026
SchedControl_Configure can take away a remote task's budget.
    SCHED_CONTEXT_SMP_009
seL4_TCB_SetPriority can decrease a remote task's priority.
    SCHED0023
seL4_TCB_Suspend can suspend a remote task.
    SCHED0024
Remote task's TCB or SC objects can be destroyed.
    SCHED_CONTEXT_0014 already exists

Test with: seL4/seL4#1662

[midnightveil]

Note: simulation tests do not currently run either SMP or MCS configurations. I'm not sure why; I was testing with QEMU locally.

EDIT: probably because the ./simulate script won't generate the SMP flags to QEMU, actually... which Ivan did seL4/seL4_tools@80ae668 (#239).