Update UnsupportedFeatures for MySQL 5.x.

The latest MySQL Server 5.6.46 and 5.7.28 are linked with OpenSSL (instead of yaSSL) and support more TLS features.

Switch back to ubuntu-latest, reverting 74e35c5.

Author: bgrainger

azure-pipelines.yml

@@ -6,7 +6,7 @@ jobs:
 - job: linux_build
   displayName: 'Linux Build'
   pool:
-    vmimage: 'ubuntu-16.04'
+    vmimage: 'ubuntu-latest'
   steps:
   - template: '.ci/build-steps.yml'
 
@@ -113,7 +113,7 @@ jobs:
   dependsOn: linux_build
   displayName: 'Linux Unit Tests'
   pool:
-    vmimage: 'ubuntu-16.04'
+    vmimage: 'ubuntu-latest'
   steps:
   - template: '.ci/mysqlconnector-tests-steps.yml'
 
@@ -129,15 +129,15 @@ jobs:
   dependsOn: linux_build
   displayName: 'Linux Tests'
   pool:
-    vmimage: 'ubuntu-16.04'
+    vmimage: 'ubuntu-latest'
   strategy:
     matrix:
       'MySQL 5.6':
         image: 'mysql:5.6'
-        unsupportedFeatures: 'Ed25519,Json,Sha256Password,RsaEncryption,LargePackets,CachingSha2Password,SessionTrack,Tls11,Tls12,Tls13,UuidToBin'
+        unsupportedFeatures: 'Ed25519,Json,Sha256Password,LargePackets,CachingSha2Password,SessionTrack,Tls13,UuidToBin'
       'MySQL 5.7':
         image: 'mysql:5.7'
-        unsupportedFeatures: 'Ed25519,RsaEncryption,CachingSha2Password,Tls12,Tls13,UuidToBin'
+        unsupportedFeatures: 'Ed25519,CachingSha2Password,Tls13,UuidToBin'
       'MySQL 8.0':
         image: 'mysql:8.0'
         unsupportedFeatures: 'Ed25519,Tls13'