Update seccomp support and logging.

See detailed documentation MR: ecp-ci.gitlab.io!90 (merged)

Extensive updates to the default behaviors and available configurations for seccomp utilization:

• Updated libseccomp-golang library to v0.10.0, this mean libseccomp must be 2.3.1+ moving forward. All CentOS/RHEL 7 deployments should meet this requirement, else seccomp must be disabled.
• Modified default block action behavior to better surface issues and stop the associated thread. If API level is sufficient then offending system call is logged.
• Optional configuration to log all allowed actions. This is envisioned primarily for debug purposes.
• It is possible to disable or enforce no_new_privs via configuration even in cases where seccomp is enabled (privileged operation).
• The plugin feature is now supported without the need of a feature flag without any breaking changes from initial release.

Related: #139 (closed) (The added documentation will hopefully help, in addition to notes regarding no-longer required default rule).

Closes: #126 (closed)