Run SonarQube analysis using jdk7

Findbugs doesn't support jdk8 yet, see
https://jira.codehaus.org/browse/MFINDBUGS-194
TEMP SAUCE LABS ON TRASK/GLOWROOT
Upgrade to checker framework 1.8.2
GC Events
MBeans
Gauges
FAILINGTEST
SonarQube inspired cleanup
TEMP run sonarqube from trask/glowroot repo