FAB-1764 CouchDB name to be consistent with chain ID

Motivation for this change:
Database creation fails on CouchDB if chainid does not meet
Couch DB database naming conventions

Chainid becomes database name in CouchDB.

CouchDB naming conventions:

Only lowercase characters (a-z), digits (0-9), and any of the characters
 _, $, (, ), +, -,and / are allowed. Must begin with a letter.

Therefore, we either need to adopt these same restrictions for
chainid naming, or have a deterministic mapping of chainid to a valid
(and unique) CouchDB database name.

The chainid also becomes a directory on the peer file system for
the block storage ledger.
Therefore the character '/' must also be avoided.

Change-Id: I0582e63b53e2afb5dee2009ede5f695775282b46
Signed-off-by: Chris Elder <[email protected]>

Author: Chris Elder

core/ledger/kvledger/txmgmt/statedb/statecouchdb/statecouchdb.go

@@ -64,12 +64,6 @@ func (provider *VersionedDBProvider) GetDBHandle(dbName string) (statedb.Version
 	provider.mux.Lock()
 	defer provider.mux.Unlock()
 
-	//TODO determine if couch db naming restrictions should apply to all ledger names
-	//TODO enforce all naming rules
-	// Only lowercase characters (a-z), digits (0-9), and any of the characters _, $, (, ), +, -, and / are allowed. Must begin with a letter.
-	// For now, we'll just lowercase the name within the couch versioned db.
-	dbName = strings.ToLower(dbName)
-
 	vdb := provider.databases[dbName]
 	if vdb == nil {
 		var err error