Fixed ContextLoad of sessions:
Fixed ContextLoad of sessions:

For the response from ContextLoad commands of sessions,
the session handle wasn't being virtualized.  This bug was found
while debugging some GetCapabilities tests for virtualized capabilities
(soon to be added code).

Also cleaned up some pretty messy code in this area.  Removed redundant
calls, added clarifying comments, and combined  blocks of code
whereever possible.

01org/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS