T275: Refactor distops tests and fix bug in delete test

Also adds a test for retyping a capability with descendants on the owning core
from another core.

Signed-off-by: Simon Gerber <simon.gerber@inf.ethz.ch>

T275: Add test for delete of distributed capabilities

Signed-off-by: Simon Gerber <simon.gerber@inf.ethz.ch>

T275: Refactor distributed retype test into framework for all distops and retype parts