This change corrects the VpnProfile's maxMtu defaults to match that of the Ikev2VpnProfile. 1400 is too high as a default, and Settings will run into an issue here quite often. Bug: 152573931 Test: FrameworksNetTests passing Change-Id: I97ba5903b3cc1ed6a21c706ed3d78bd8ecbeee0c Merged-In: I97ba5903b3cc1ed6a21c706ed3d78bd8ecbeee0c (cherry picked from commit d0a44f49df01a1aefa505ee90c9806dee135b4e4)