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Signed-off-by: balaskoa <Jeno.Balasko@ericsson.com>

TS 29.118 Section 9.4.13 is very clear abou the MME name, i.e. that it
is encoded as a DNS name, with each label prefixed by the binary length
of the given label.

However, the MME_Name and VLR_Name types in SGsAP_Types.ttcn so far were
defined as "charstring", which is incompatible with the above.

Change-Id: Ic38234ee1469b557d46397f54fad80241b692baa
Signed-off-by: Harald Welte <laforge@gnumonks.org>