Remediation should support chroot environments

#### Description of problem:

When running in a chroot environment, such as a kiwi appliance build, where /proc is not available, application of sysctl specific rules fails. Those rules try to read and set active kernel parameters, which requires a running system. In a chroot env, application of those rules should be limited to handling files /etc/sysctl.d/. Similarly, any rule that requires a running systemd fails too (see also https://github.com/ComplianceAsCode/content/issues/10945), and should be limited to configuring and enabling or disabling services.

Generally speaking, there should be an offline mode in which all operations that require a running system are skipped, so remediation in an appliance build is possible.

#### SCAP Security Guide Version:

0.1.68