IOSAD-157 Change delegate method name and docs

pEpObjCAdapter/PEPSync.m

@@ -254,7 +254,7 @@ static __weak PEPSync *s_pEpSync;
         self.conditionLockForJoiningSyncThread = nil;
         if (!isFromShutdown) {
             // Only inform the delegate if the shutdown came from the engine
-            [self.notifyHandshakeDelegate keySyncDisabled];
+            [self.notifyHandshakeDelegate engineShutdownKeySync];
         }
     }
 

pEpObjCAdapterFramework/PEPNotifyHandshakeDelegate.h

@@ -38,7 +38,8 @@
                      partner:(PEPIdentity * _Nonnull)partner
                       signal:(PEPSyncHandshakeSignal)signal;
 
-/// Sent when the sync loop was shut down
-- (void)keySyncDisabled;
+/// Sent when the sync loop was shut down by the engine,
+/// e.g. in response to leving the device group
+- (void)engineShutdownKeySync;
 
 @end

pEpObjCTests/PEPSessionTest.m

@@ -1317,7 +1317,7 @@
     XCTAssertNil(error);
 
     // leaving a device group should disable sync
-    XCTAssertTrue(self.notifyHandshakeDelegate.engineDisabledKeySync);
+    XCTAssertTrue(self.notifyHandshakeDelegate.engineDidShutdownKeySync);
 
     [self shutdownSync];
 }

pEpObjCTests/TestUtils/PEPSessionTestNotifyHandshakeDelegate.h

@@ -13,6 +13,6 @@
 @interface PEPSessionTestNotifyHandshakeDelegate : NSObject<PEPNotifyHandshakeDelegate>
 
 /// This is set to YES if the _engine_ shut the sync loop down.
-@property (nonatomic) BOOL engineDisabledKeySync;
+@property (nonatomic) BOOL engineDidShutdownKeySync;
 
 @end

pEpObjCTests/TestUtils/PEPSessionTestNotifyHandshakeDelegate.m

@@ -18,9 +18,9 @@
     return PEPStatusOK;
 }
 
-- (void)keySyncDisabled
+- (void)engineShutdownKeySync
 {
-    self.engineDisabledKeySync = YES;
+    self.engineDidShutdownKeySync = YES;
 }
 
 @end