VOL-1845 : Support for delete device in openolt adapter

           This commit is for the handling of delete device.

           The changes are done to handle the request for delete
           device. This includes the clearing of all data related
           to the device in KV store and reboot of device to reset
           the device.

           This commit has dependency in voltha-go so that needs to
           be merged first. Please refer this review link
           https://gerrit.opencord.org/#/c/15084/

           Updated to dep ensure above voltha-go patch set.  Also typo
           and make lint/sca fixes.

Change-Id: I53f16022c6902d498dad30e9b7d0ff50bf156347
diff --git a/vendor/github.com/opencord/voltha-go/db/kvstore/client.go b/vendor/github.com/opencord/voltha-go/db/kvstore/client.go
index 937eefe..67c9219 100644
--- a/vendor/github.com/opencord/voltha-go/db/kvstore/client.go
+++ b/vendor/github.com/opencord/voltha-go/db/kvstore/client.go
@@ -77,7 +77,7 @@
 	return evnt
 }
 
-// Client represents the set of APIs  a KV Client must implement
+// Client represents the set of APIs a KV Client must implement
 type Client interface {
 	List(key string, timeout int, lock ...bool) (map[string]*KVPair, error)
 	Get(key string, timeout int, lock ...bool) (*KVPair, error)
@@ -90,6 +90,7 @@
 	Watch(key string) chan *Event
 	AcquireLock(lockName string, timeout int) error
 	ReleaseLock(lockName string) error
+	IsConnectionUp(timeout int) bool // timeout in second
 	CloseWatch(key string, ch chan *Event)
 	Close()
 }