Update build to use v0.9.7 of go-libp4dlog

Avoids node_exporter errors due to invalid metric label values
Update to go 1.17

Update build to use v0.9.6 of go-libp4dlog

Write metrics to a cached file and rename it - avoids race conditions…

… with node_exporter

Update to avoid backslash quoting errors

Ensure bad-UTF8 is filtered out

Clarify install instructions and update dependency

Update p4prometheus release to download from 0.4.0 to 0.6.0

Added config output_cmds_by_user/case_sensitive_server with tests

Added troubleshooting section

More config details including alerts