FAB-1162 read MSP cfg from a global path

https://jira.hyperledger.org/browse/FAB-1162

Anytime we assume full peer environment to be there (such as  based on GOPATH)
we prevent other environments that don’t have the full fabric from working.

We will follow other use of PEER_CFG_PATH to break that implied strong association
with a full fabric path.

Change-Id: Ief1e7b9e56f78039095e3ed29c588360b4bc6eab
Signed-off-by: Srinivasan Muralidharan <muralisr@us.ibm.com>

peer/main.go

@@ -121,7 +121,14 @@ func main() {
 
 	// Init the MSP
 	// TODO: determine the location of this config file
-	mspMgrConfigFile := os.Getenv("GOPATH") + "/src/github.com/hyperledger/fabric/msp/peer-config.json"
+	var mspMgrConfigFile string
+	if alternativeCfgPath != "" {
+		mspMgrConfigFile = alternativeCfgPath + "/msp/peer-config.json"
+	} else if _, err := os.Stat("./peer-config.json"); err == nil {
+		mspMgrConfigFile = "./peer-config.json"
+	} else {
+		mspMgrConfigFile = os.Getenv("GOPATH") + "/src/github.com/hyperledger/fabric/msp/peer-config.json"
+	}
 	err = msp.GetManager().Setup(mspMgrConfigFile)
 	if err != nil {
 		panic(fmt.Errorf("Fatal error when reading MSP config file %s: err %s\n", mspMgrConfigFile, err))