Sub/unsub cleanups (#1535)

* Sub/unsub cleanups

* drr full idAndIndex

* Memo on nick call

* refCountDelay

* Remove scheduler param, always asap

* Flatten

* Test cleanups

* Make tests pass

* Remove logs

* Drop nick memo

* sourceConnection.unsubscribe

* Small cleanups

packages/api-derive/src/chain/bestNumber.ts

@@ -8,7 +8,7 @@ import { Observable } from 'rxjs';
 import { map } from 'rxjs/operators';
 import { ApiInterfaceRx } from '@polkadot/api/types';
 
-import { drr } from '../util/drr';
+import { drr } from '../util';
 
 /**
  * @name bestNumber

packages/api-derive/src/chain/bestNumberFinalized.ts

@@ -8,7 +8,7 @@ import { Observable } from 'rxjs';
 import { map } from 'rxjs/operators';
 import { ApiInterfaceRx } from '@polkadot/api/types';
 
-import { drr } from '../util/drr';
+import { drr } from '../util';
 
 /**
  * @name bestNumberFinalized

packages/api-derive/src/chain/bestNumberLag.ts

@@ -9,7 +9,7 @@ import { map } from 'rxjs/operators';
 import { ApiInterfaceRx } from '@polkadot/api/types';
 import { createType } from '@polkadot/types';
 
-import { drr } from '../util/drr';
+import { drr } from '../util';
 import { bestNumber } from './bestNumber';
 import { bestNumberFinalized } from './bestNumberFinalized';
 

packages/api-derive/src/chain/getHeader.ts

@@ -7,7 +7,7 @@ import { catchError, map } from 'rxjs/operators';
 import { ApiInterfaceRx } from '@polkadot/api/types';
 
 import { HeaderExtended } from '../type';
-import { drr } from '../util/drr';
+import { drr } from '../util';
 import { HeaderAndValidators } from './subscribeNewHeads';
 
 /**

packages/api-derive/src/chain/subscribeNewHeads.ts

@@ -9,7 +9,7 @@ import { Observable, combineLatest, of } from 'rxjs';
 import { map, switchMap } from 'rxjs/operators';
 
 import { HeaderExtended } from '../type';
-import { drr } from '../util/drr';
+import { drr } from '../util';
 
 export type HeaderAndValidators = [Header, AccountId[]];