gmetad: avoid spurious insertions into the summary hash table
gmetad: avoid spurious insertions into the summary hash table

eliminates the extra string metrics which were being inserted into the summary
hash since r1185


mjzhou/monitor-core,hinesmr/monitor-core,ganglia/monitor-core,phreakocious/monitor-core,mjzhou/monitor-core,ganglia/monitor-core,fastly/monitor-core,sdgdsffdsfff/monitor-core,NoodlesNZ/monitor-core,sdgdsffdsfff/monitor-core,ganglia/monitor-core,NoodlesNZ/monitor-core,lawrencewu/monitor-core,hinesmr/monitor-core,mjzhou/monitor-core,lawrencewu/monitor-core,phreakocious/monitor-core,hinesmr/monitor-core,NoodlesNZ/monitor-core,torkelsson/monitor-core,torkelsson/monitor-core,dmourati/monitor-core,mjzhou/monitor-core,fastly/monitor-core,phreakocious/monitor-core,lawrencewu/monitor-core,ganglia/monitor-core,fastly/monitor-core,dmourati/monitor-core,fastly/monitor-core,mjzhou/monitor-core,ganglia/monitor-core,NoodlesNZ/monitor-core,ganglia/monitor-core,torkelsson/monitor-core,mjzhou/monitor-core,dmourati/monitor-core,lawrencewu/monitor-core,sdgdsffdsfff/monitor-core,torkelsson/monitor-core,torkelsson/monitor-core,lawrencewu/monitor-core,NoodlesNZ/monitor-core,hinesmr/monitor-core,phreakocious/monitor-core,lawrencewu/monitor-core,sdgdsffdsfff/monitor-core,NoodlesNZ/monitor-core,NoodlesNZ/monitor-core,torkelsson/monitor-core,sdgdsffdsfff/monitor-core,lawrencewu/monitor-core,mjzhou/monitor-core,fastly/monitor-core,sdgdsffdsfff/monitor-core,dmourati/monitor-core,phreakocious/monitor-core,fastly/monitor-core,ganglia/monitor-core,fastly/monitor-core,dmourati/monitor-core,phreakocious/monitor-core,ganglia/monitor-core,phreakocious/monitor-core,hinesmr/monitor-core,dmourati/monitor-core,torkelsson/monitor-core,sdgdsffdsfff/monitor-core