vSphere UUID discovery is broken on >=6.5+ machines

[Erlon R. Cruz]

When upgrading the vSphere hardware from 5.5 -> 6.5 no more PVCs
can be created. This happens because of a bug on the SEABIOS virtual hardware that swap the endianness of the content of
 /sys/class/dmi/id/product_uuid" on the new virtual hardware
versions and now it differs from "/sys/class/dmi/id/product_serial".
So,

The contents in product_uuid is: F5132842-20D4-6171-5DB0-7B96440CCF54
While the product_serial (actually correct and understood by vSphere API) is:422813f5-d420-7161-5db0-7b96440ccf54

The error in Kubernetes looks like this:

Error while obtaining Kubernetes node nodeVmDetail details. error : No VM found
Unable to find VM by UUID. VM UUID: df733542-342d-bfe2-dff0-9214803f2dca

Full log here: https://pastebin.ubuntu.com/p/yFGbKjpvDg/

[Erlon R. Cruz (sombrafam)]

Pull requests submitted:
Master: https://github.com/charmed-kubernetes/charm-kubernetes-master/pull/102
Worker: https://github.com/charmed-kubernetes/charm-kubernetes-worker/pull/64

[Erlon R. Cruz (sombrafam)]

Hi folks, just adding some artifacts with the tests I did on the fixes mentioned:

 - Master: Kubectl version
 - vSphere env: https://i.imgur.com/DejmLjN.png
 - Worker IDs: https://gist.github.com/sombrafam/80b668d3b2c78900ea41251ab0d0bd83
 - Bastion: kc get sc: https://gist.github.com/sombrafam/9fd46e7e94467b5709fb3ac5db24b170

 Before patch:
 - Print charm version: https://gist.github.com/sombrafam/ad01f97268e554b11a90daed9997333d
 - Worker: ps aux | grep kube: https://gist.github.com/sombrafam/01436909871d07336d13e32c7e0f5776
 - kc get pvc && kc describe pvc: https://gist.github.com/sombrafam/a9d87d66e79693cf0251ff940ec95b01
 - Logs creating pvc: https://pastebin.ubuntu.com/p/JMC38PbFhx/

 After patch:
 - Print charm version: https://gist.github.com/sombrafam/cf0ce36fae68e54742e5603220039a17
 - Worker: ps aux | grep kube: https://gist.github.com/sombrafam/5edb3c4addaf1d4be6f07bbd5b1abac8
 - kc get pvc && kc describe pvc: https://gist.github.com/sombrafam/a790a751a07e03e98107fe006944cf06
 - Logs creating pvc: https://gist.github.com/sombrafam/d0c9e19685bdcc7f5d9edc6f0a179d85

[Erlon R. Cruz (sombrafam)]

Moved common code to kubernetes common:

Master: https://github.com/charmed-kubernetes/charm-kubernetes-master/pull/102
Worker: https://github.com/charmed-kubernetes/charm-kubernetes-worker/pull/64
Common: https://github.com/charmed-kubernetes/layer-kubernetes-common/pull/15