GTP_Templates: Fix runtime error in tr_EuaIPv*() templates

Doing this when receiving an IPv4 EUA thwos an error:
"if (not match(cpr.endUserAddress, tr_EuaIPv4(?)) and not match(cpr.endUserAddress, tr_EuaIPv6(?)))"

Dynamic test case error: Performing lengthof() operation on an octetstring template with no exact length.

This happens if for instance received spare bits are set to '0000'.

Change-Id: I70ad3c10e2ecfed8f733ff906272a9597b2ab9bd
1 file changed