Fix freebsd building

v2.1.5

Disable go modules for FreeBSD build

Make default gonfig's path configurable

• Make default config's path configurable
• Add grafsy-client to the FreeBSD package
• Add custom version and ConfigPath parameters in freebsd binaries

Fix postinst for some edge cases

• /usr/bin/tar doesn't exist in debian, use /usr/bin/env to determine the correct place
• Check if systemd is up and running before trigger daemon-reload and restart in postinst
• Check if grafsy disabled before enabling

grafsy-client and retryKeepSecs

• Implement grafsy-client for easy metrics sending into a daemon
• Add RetryKeepSecs parameter to configure safe caching time
• Update README.md: installation, RetryKeepSecs, client description

Fix debian packages

The previous version has a bug with postinst script.

• Documentation updated: badge, link to godocs
• Postinst fixed
• Tests for packages integrity

Release 2.1.0

It makes sense to review by commits.

The change list:
Code:

• Add monitoring metric for aggregations
• Add option to build static binary w/o C bindings to ACL library
• Add -v flag
• Add logging to STDOUT

Infrastructure:

• Build a docker image
• Move from Travis to GH actions
• Use FPM to build a package
• Optimize allowedMetrics example