Remove ping.html page from the diff excludes file
Remove ping.html page from the diff excludes file

Diff exclude patterns are used to match base names. So excluding with
the directory context does not work.

Besides, it's not wrong to see the file in the diff. We know and accept
this files doesn't exist in the JAX-RS 1.1 impl.

burmanm/hawkular-metrics,pilhuhn/rhq-metrics,hawkular/hawkular-metrics,jotak/hawkular-metrics,burmanm/hawkular-metrics,spadgett/hawkular-metrics,hawkular/hawkular-metrics,hawkular/hawkular-metrics,tsegismont/hawkular-metrics,jotak/hawkular-metrics,pilhuhn/rhq-metrics,burmanm/hawkular-metrics,spadgett/hawkular-metrics,jotak/hawkular-metrics,ppalaga/hawkular-metrics,ppalaga/hawkular-metrics,tsegismont/hawkular-metrics,pilhuhn/rhq-metrics,spadgett/hawkular-metrics,hawkular/hawkular-metrics,mwringe/hawkular-metrics,burmanm/hawkular-metrics,ppalaga/hawkular-metrics,mwringe/hawkular-metrics,mwringe/hawkular-metrics,spadgett/hawkular-metrics,ppalaga/hawkular-metrics,mwringe/hawkular-metrics,pilhuhn/rhq-metrics,tsegismont/hawkular-metrics,jotak/hawkular-metrics,tsegismont/hawkular-metrics,spadgett/hawkular-metrics