Duplication of config structures in open_yurt scripts

[leokondrashov]

Describe the enhancement

In addition of OpenYurt deployment to the vHive, structures SystemEnvironmentStruct, KubeConfigStruct, KnativeConfigStruct significantly duplicate the existing structures in scripts/configs. That makes the code hard to maintain configs (need to update the format in several places).

The solution is to reuse existing ones instead of copy-pasting the content.

[lrq619]

Will handle this in the next development iteration