Support ICMP tests with larger packet size

Add ping test with full MTU size and minimal IPv6 MTU size probes.
This helps to diagnose possible MTU issue in the bugreport.

Bug: 277376698
Test: adb shell dumpsys connectivity --diag
(cherry picked from https://android-review.googlesource.com/q/commit:ef0f51857533295be858b41ffe109b70d62c7ef6)
Merged-In: I0650de1f07fadcac189a40817bcc1a70be2e2b6c
Change-Id: I0650de1f07fadcac189a40817bcc1a70be2e2b6c
1 file changed