Improve test and fix doulbe-close fd problem for async DNS API cts

1. Change test cases for enlarging buffer size of FrameworkListener.
2. Remove test procedure which caused doulbe-close fd.

Bug: 129317069
Bug: 126307309
Test: atest CtsNativeNetDnsTestCases MultinetworkApiTest
Change-Id: I8d871cebca6fa7e298a874ba430ec0aaa05c0eed
2 files changed
tree: 4ba7eff1b3ae73e07b5cb79bd55786d20a9a6439
  1. tests/