Move existing schemas into folders

Reorganize the existing schemas into folders under redfish core.

The existing schema system has some problems:
1. It's hard to add new schemas
2. We have to rerun

Move existing schemas into folders

Reorganize the existing schemas into folders under redfish core.

The existing schema system has some problems:
1. It's hard to add new schemas
2. We have to rerun the script any time we want to change what schemas
we use.
3. Adding schemas optionally takes effort

In an effort to combat this, this patchset moves all the existing
schemas into folders that represent their namespace names

dmtf/csdl represents the CSDL that dmtf publishes
oem/openbmc represents the CSDL that OpenBMC publishes

In theory, this means that in the future we can relax OEM_SCHEMAS.md,
and allow folks to possibly implement their own schemas in a way that
doesn't have to effect all other systems.

This also has the advantage of not requiring changes to
update_schemas.py when we want to add, remove, or modify what version of
a schema we use. "current" schemas are just symlinks, so they can be
updated using git, and not necessarily have merge conflicts with one
another.

Tested: Redfish service validator passes.

Change-Id: I6d4a130bba4cb874ef00a06ed579cc67f53dc7ae
Signed-off-by: Ed Tanous <ed@tanous.net>

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