Provide a way to change the alias of a KRE

[Praburaj]

For example:
I set alias of particular KRE to alias1. I would like to update the alias to alias2.

[graemechristie]

We can already have multiple aliases for a single version of a KRE, and you can set an alias to another alias. If we implement #319, and provide a simple way to delete an alias, would this be sufficient. i.e. for your scenario above you would simply have (changing the alias name to myalias to avoid confusion with the alias keyword)

kvm alias myalias2 myalias
kvm delete alias myalias

[glennc]

We should have kvm delete alias but we don't need to implement rename on top

[glennc]

Closing, we will implement #319 to allow the experience to work