pressure pulse test p_fu_lumped_22.i tightened convergence criteria and regolded.  Fixes #3368
Merge pull request #3370 from WilkAndy/test_fail_3368

pressure pulse test p_fu_lumped_22 relaxed tolerance to ensure test runs...
Merge commit '1053385457c87211f2312e41fee5d177b92d657b'