Exclude code from SonarCloud analysis

- Generated code
- Test support
- External library wrappers

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

sonar-project.properties

@@ -2,7 +2,7 @@ sonar.projectKey=submariner-io_submariner
 sonar.projectName=submariner
 sonar.organization=submariner-io
 sonar.sources=.
-sonar.exclusions=**/vendor/**,**/*_test.go,**/test/**,**/fake/**,**/client/**
+sonar.exclusions=**/vendor/**,**/*_test.go,**/test/**,**/fake/**,**/client/**,**/natdiscovery/proto/natdiscovery.pb.go,**/netlink/**,**/event/testing/**,**/zz_generated.deepcopy.go,**/ipset/**
 sonar.tests=.
 sonar.test.inclusions=**/*_test.go,**/test/**,**/fake/**
 sonar.test.exclusions=**/vendor/**,**/client/**