tests: passthrough meson --test-args to pytest

Currently, to my knowledge, there is no way to filter tests when running
the testsuite through meson. Manually invoking pytest is the only way.

This PR allows such CLI invocation to be possible to filter tests
containing "recovery":

    meson test -C obj --test-args="-k recovery"

Signed-off-by: Khang D Nguyen <khangng@os.amperecomputing.com>

Author: khangng-ampere

meson.build

@@ -124,7 +124,7 @@ if tests
     # redirecting to a file. We can detect this if stdout is an terminal, and
     # disable TAP protocol.
     pytest = find_program('pytest')
-    script = '''export DBUS_STARTER_BUS_TYPE=user; if [ ! -t 1 ]; then PYTEST_FLAGS="--tap"; fi; @0@ $PYTEST_FLAGS'''.format(pytest.full_path())
+    script = '''export DBUS_STARTER_BUS_TYPE=user; if [ ! -t 1 ]; then PYTEST_FLAGS="--tap"; fi; @0@ $PYTEST_FLAGS $@'''.format(pytest.full_path())
     sh = find_program('sh')
     dbus_run_session = find_program('dbus-run-session')
 
@@ -140,7 +140,7 @@ if tests
 
     test('test-mctpd', dbus_run_session,
         depends: mctpd_test,
-        args: [ sh.full_path(), '-c', script ],
+        args: [ sh.full_path(), '-c', script, '--' ],
         protocol: 'tap',
     )
 endif