IOT-1447 Fix scope_id usage

IOT-1447 Fix scope_id usage

Never assume that a scope id and an interface index are the same.
Removed bad code from the tcp adapter; the scope id should always
be present in the addr string of a scoped IPv6 address, and is correctly
handled by CAConvertNameToAddr and CAConvertAddrToName.

Change-Id: I19f8739d7da2e7944e3904770ca0d8e914608ba2
Signed-off-by: Dave Thaler <dthaler@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13181
Reviewed-by: Jaewook Jung <jw0213.jung@samsung.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: David Antler <david.a.antler@intel.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>