Update readme

Makefile

@@ -1,6 +1,6 @@
 
 try:
-	snapcraft try
+	snapcraft try --use-lxd
 	snap try prime
 
 sync:
@@ -12,4 +12,4 @@ test:
 		./log \
 		./snapctl \
 		./env \
-		./options
+		./options

README.md

@@ -88,7 +88,7 @@ sudo edgex-snap-hooks.test ./snapctl -run TestGet
 
 #### Development
 ```
-SNAPCRAFT_BUILD_ENVIRONMENT=lxd make try
+make try
 ```
 
 You can now edit the files locally, copy them to prime directory, and re-run the

snapctl/README.md

@@ -1,12 +1,12 @@
 # snapctl
 Go wrapper library for the [snapctl](https://snapcraft.io/docs/using-snapctl) tool.
 
-Wrappers for following subcommands are implemented:
+Wrappers for following subcommands are partially implemented for EdgeX use cases:
 
 - [ ] `fde-setup-request`: Obtain full disk encryption setup request
 - [ ] `fde-setup-result`: Set result for full disk encryption
 - [x] `get`: The get command prints configuration and interface connection settings.                
-- [ ] `is-connected`: Return success if the given plug or slot is connected, and failure otherwise   
+- [x] `is-connected`: Return success if the given plug or slot is connected, and failure otherwise
 - [ ] `reboot`: Control the reboot behavior of the system          
 - [x] `restart`: Restart services    
 - [x] `services`: Query the status of services      
@@ -96,4 +96,4 @@ func main() {
 		panic(err)
 	}
 }
-```
+```

snapctl/is-connected.go

@@ -76,7 +76,6 @@ func (cmd isConnected) Run() (bool, error) {
 	args = append(args, cmd.plug)
 
 	out, err := run("is-connected", args...)
-
 	if err != nil && out == "" {
 		return false, nil
 	} else if err != nil {