This updates fluentbit to version v0.14.2, which includes
the Modify plugin (required for trimming underscores from
systemd log fields, necessary for kibana visualization). This also
updates the fluentbit configuration util to allow for renaming
multiple entries in an event. This is required because the values
definition for a configuration section is defined as a map, and
does not supported multiple Rename directives
Change-Id: I05172e8236282a438587887f4a806cf35c4b6c68
8e2d3a5b4c