meson: increase functional test timeout

sometimes these fail with timeouts on loaded machines. let's up the
timeouts until we can pull the tests apart to more reasonable sizes

Change-Id: I2dfff2183cc1f3ff5e6107f43748ac046fe00d05

tests/functional/meson.build

@@ -176,5 +176,8 @@ foreach script : functional_tests_scripts
     env : {
       'MESON_BUILD_ROOT': meson.project_build_root(),
     },
+    # some tests take 15+ seconds even on an otherwise idle machine, on a loaded machine
+    # this can easily drive them to failure. give them more time, 5min rather than 30sec
+    timeout : 300,
   )
 endforeach