Hardening/431 tenants made lowercase

### Description
o Tenant names changed to all lowercase upon reception of a request
o Two bugs on buffer length fixed (thanks to the new compiler on Ubuntu 13.10)
o Better check on proxyCoap running in harnessFunctions.sh
o testHarness.sh no longer hangs on 'ERROR 11'
o Added descriptive texts to the errors in testHarness.sh
o Commented out one more LM_T right before call to MHD_start_daemon
o make test now uses DEBUG compilation of broker

This PR fixes issue #431

**Fermin:** actully, this PR doesn't fixed #431, it provides a workaround. But #431 will still opened until we can develop a final solution to implement case-senstive tenant.