When upgrade from RHS2.0 to RHS2.1 fails with rhs_upgrade.py, how to resolve it.

Issue

• Upgrading from RHS2.0 to RHS2.1 fails when executing rhs_upgrade.py with Error Class Code: 70.
• When you try rhs_upgrade.py, then you get following error messages.

Error Message:
    Insufficient Software Channel Entitlements:

    cfid9170  Red Hat Enterprise Linux Server (v. 6) Extended Update Support

note: One of the above Software Channel Entitlement(s) are required
to provides access to: cid17799 RHEL EUS Server (v. 6.4.z for 64-bit x86_64)
Error Class Code: 70