This test runs a selection of collectors against the fixtures and
compares the output to a reference.
The uname and filesystem collectors are disabled because they use system
calls that cannot be fixtured easily.
Remove all hardcoded references to `/proc`. For all collectors that do
not use `github.com/prometheus/procfs` yet, provide a wrapper to
generate the full paths.
Reformulate help strings, errors and comments to remove absolute
references to `/proc`.
This is a breaking change: the `-collector.ipvs.procfs` flag is removed
in favor of the general flag. Since it only affected that collector it
was only useful for development, so this should not cause many issues.
Nick Owens
Matthias Rampke
Jonas Große Sundrup