This commit adds indexing perfkit result data into ElasticSearch.
The results will be able to be aggregated and visualized over various
points of metadata.
+ Improved creating a result directory to help support testing PerfKit
indexing with pre-loaded results from previous runs.
+ Add additional error logging when unable to index results.
Change-Id: Ic18b43f19d75a061c117de6ba41545c68792e27c