Remove token service trace logging in tests

This commit removes some trace logging for the token service in the
rolling upgrade tests. If there is an active investigation here, it
would be best to annotate this line with a comment in the source
indicating such. From my digging, it does not appear there is an active
investigation that relies on this logging, so we remove it.

Author: jasontedor

x-pack/qa/rolling-upgrade/build.gradle

@@ -121,7 +121,6 @@ for (Version version : bwcVersions.wireCompatible) {
         setting 'xpack.security.transport.ssl.enabled', 'true'
         setting 'xpack.security.authc.token.enabled', 'true'
         setting 'xpack.security.authc.token.timeout', '60m'
-        setting 'logger.org.elasticsearch.xpack.security.authc.TokenService', 'trace'
         setting 'xpack.security.audit.enabled', 'true'
         rootProject.globalInfo.ready {
             if (project.inFipsJvm) {
@@ -191,7 +190,6 @@ for (Version version : bwcVersions.wireCompatible) {
             setting 'xpack.security.enabled', 'true'
             setting 'xpack.security.transport.ssl.enabled', 'true'
             setting 'xpack.security.authc.token.timeout', '60m'
-            setting 'logger.org.elasticsearch.xpack.security.authc.TokenService', 'trace'
             rootProject.globalInfo.ready {
                 if (project.inFipsJvm) {
                     setting 'xpack.security.transport.ssl.key', 'testnode.pem'