fix(package): make rpm verify pass after installation

[affo]

This change sets the ownership of directories on package generation with fpm instead that in post-install to make rpm -V pass.

For more details, see: influxdata/EAR#716

• CHANGELOG.md updated with a link to the PR (not the Issue)
• Rebased/mergeable
• Tests pass
• swagger.json updated (if modified Go structs or API)
• Sign CLA (if not already signed)

[affo]

It is not clear to me how these changes should be related to these files in the InfluxDB repo: https://github.com/influxdata/influxdb/tree/master/chronograf/etc

[gunnaraasen]

Looks like it does what is intended but I'm not familiar enough with RPM to know if this is the right way for RPM.

[affo]

Looks like it does what is intended but I'm not familiar enough with RPM to know if this is the right way for RPM.

Thank you @gunnaraasen for the review. I am not super-familiar with RPM too, however I tested it manually on a CentOS container and it works.

It is worth mentioning that this PR applies the same code as others that got merged in Telegraf (influxdata/telegraf#5716) and Kapacitor (influxdata/kapacitor#2186). The same is for InfluxDB, but I still need a review on that (influxdata/influxdb#13397). I am trying to keep the code consistent among them, although I need to update Kapacitor's one post-install.sh to match this implementation.