Added logging of tokens as hex for readability.

Added logging of tokens as hex for readability.

Tokens being printed as hex.
Removed printing of ASCII tokens as token not guranteed to be null
terminated. There seems to be some discussion about this issue in
IOT-380.

Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Change-Id: I9756c552f3abc3acdadb9e9fe4b9eb20d7ecf3eb
Reviewed-on: https://gerrit.iotivity.org/gerrit/501
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>