[FAB-2487] Change test string to comply with rule
[FAB-2487] Change test string to comply with rule

Commit 94d7e9 introduced a more strict rule of channel name.
This CR changes channel name in multichain test to comply with it.

Change-Id: I9dbca9e08c55b0d289b0340f3f52325e41827ac9
Signed-off-by: Jay Guo <91d7eeb83d08be0dc56ea674009c4b53383e15b3@gmail.com>
Signed-off-by: Kostas Christidis <e1a8399e36effe75a124102eb2a2bdfc82e0aab4@christidis.io>

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