This updates the helm tests for the fluent-logging chart to make
them more robust in being able to check for indexes defined in the
chart. This is done by calculating the combined flush interval
for both fluentbit and fluentd, and sleeping for at least one
flush cycle to ensure all functional indexes have received logged
events.
Then, the test determines what indexes should exist by checking
all Elasticsearch output configuration entries, determining
whether to use the default logstash-* index or the logstash_prefix
configuration value if it exists. For each of these indexes, the
test checks whether the indexes have successful hits (ie: there
have been successful entries into these indexes)
Change-Id: I36ed7b707491e92da6ac4b422936a1d65c92e0ac
78283495f0