refs #27 Attempted fix of hardcoded user/path for keystore, try to use
CCND keystore, add method signature to ccndcontro.executeCommand to
enable passing of a KeyManager.

This doesn't yield the desired result.  Will back out this change and
revert to using a regular user keystore.
refs #27 Implement ccndadmin user for use in CCNxTxRxRelay