DoH: Send pending data out right after handle a buffered DNS request am:...

DoH: Send pending data out right after handle a buffered DNS request am: 607f74e7 am: fa750b53 am: a57d1c8c am: 574afeac am: 3d30dcb3

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2617069



Change-Id: I8e8f553e792c7940fa47d2d302810afbc9b25d45
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>