Add SDK version check to skip S added API test

NetworkAgentConfigTest is a part of CtsNetTestCasesLatestSdk.
It will be used in mainline test with a R build. Test will
fail with method not found error. Add a version check to skip
the S added API tests.

Test: atest NetworkAgentConfigTest in R and S device
Fix: 185151127
Change-Id: Ib372e68afa99af455eb2713c8f6f1c8ef1d4cfdf
1 file changed