Rework peer connection status based on the update channel existence (#1213)

With this change, we don't need to update all peers on startup. We will
check the existence of an update channel when returning a list or single peer on API.
Then after restarting of server consumers of API will see peer not
connected status till the creation of an updated channel which indicates
peer successful connection.

management/server/account.go

@@ -103,6 +103,7 @@ type AccountManager interface {
 	UpdateAccountSettings(accountID, userID string, newSettings *Settings) (*Account, error)
 	LoginPeer(login PeerLogin) (*Peer, *NetworkMap, error) // used by peer gRPC API
 	SyncPeer(sync PeerSync) (*Peer, *NetworkMap, error)    // used by peer gRPC API
+	GetAllConnectedPeers() (map[string]struct{}, error)
 }
 
 type DefaultAccountManager struct {
@@ -1558,6 +1559,11 @@ func (am *DefaultAccountManager) getAccountWithAuthorizationClaims(claims jwtcla
 	}
 }
 
+// GetAllConnectedPeers returns connected peers based on peersUpdateManager.GetAllConnectedPeers()
+func (am *DefaultAccountManager) GetAllConnectedPeers() (map[string]struct{}, error) {
+	return am.peersUpdateManager.GetAllConnectedPeers(), nil
+}
+
 func isDomainValid(domain string) bool {
 	re := regexp.MustCompile(`^([a-z0-9]+(-[a-z0-9]+)*\.)+[a-z]{2,}$`)
 	return re.Match([]byte(domain))