iotests: add a meson suite / make target per block I/O tests format
Currently each block format is classified as either 'quick', 'slow' or 'thorough' and this controls whether its I/O tests are added to the meson suites 'block-quick', 'block-slow' or 'block-thorough'. This suites are exposed the 'check-block' make target, accepting the optional SPEED variable. As we add more formats to the 'thorough' group, however, it becomes increasingly large and time consuming to run. What is needed is a make target that can exercise all tests for an individual format, regardless of speed classification. This makes use of the previous enhancement to mtest2make.py to introduce new meson suites 'block-$FORMAT-optional', which translate to new top level make targets 'check-block-$FORMAT'. These new targets always run all tests and as such do not need the SPEED variable to be set, but are not triggered by 'make check' or 'make check-block'. Reviewed-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@oss.qualcomm.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>