[FAB-9702] Orderer defaults to invalid system chan
[FAB-9702] Orderer defaults to invalid system chan

The orderer default channel name for the orderer system channel was
recently modified to be test_orderer_system_channel.  Underscores are
not legal characters in channel IDs though, so the orderer panics at
startup.  This CR simply changes the underscores to dashes.

Change-Id: I4e826a5abc4c0d42cda7e362fbd7a6054c044d23
Signed-off-by: Jason Yellick <3a1724207862302656e55e6f840a9996dad69e59@us.ibm.com>

manish-sethi/fabric,jimthematrix/fabric,manish-sethi/fabric-sidedb,binhn/fabric,manish-sethi/fabric,manish-sethi/fabric-sidedb,xixuejia/fabric,hyperledger/fabric,hyperledger/fabric,stemlending/fabric,binhn/fabric,stemlending/fabric,xixuejia/fabric,jimthematrix/fabric,muralisrini/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,binhn/fabric,manish-sethi/fabric-sidedb,xixuejia/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,muralisrini/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,manish-sethi/fabric-sidedb