Automatic merge from submit-queue (batch tested with PRs 65449, 65373, 49410). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
add kernel config locations for fedora and atomic
**What this PR does / why we need it**:
* Fedora stores its kernel configs in /usr/lib/modules/$(uname -r)/config
* Fedora/CentOS/RHEL atomic hosts use /usr/lib/ostree-boot/$(uname -r), though this location is deprecated
* The lack of these locations in the validator is causing kubeadm to hang on "failed to parse kernel config" in its preflight checking on fedora and atomic host
**Special notes for your reviewer**:
**Release note**:
```release-note
```
Pulled SysSpecs out of types.go and created two os specific implementations with build tags
Similarly created conditionally compiled implementations of KernelValidationHelper to get Kernel version in os specific manner, as well as os specific docker endpoints (socket vs named pipes)
* Fedora stores its kernel configs in /usr/lib/modules/$(uname -r)
* Fedora/CentOS/RHEL atomic hosts use /usr/lib/ostree-boot, though this location is deprecated
* The lack of these locations in the validator is causing kubeadm to hang on "failed to parse kernel config" in its preflight checking on fedora and atomic host
This change allows validators to pass warnings as well as errors. This
was needed because of how support for docker 1.13+ and the new EE and CE
versions is currently being handled.
