Removed old rules from eslint

Tried hand at testing by fixing the spec files with import. However, still many errors and given up now.

overlord/src/app/attendance/attendance.service.spec.ts

@@ -1,15 +1,17 @@
 import { inject, TestBed } from '@angular/core/testing';
+import { HttpClientModule } from '@angular/common/http';
 
-import { VoucherService } from './attendance.service';
+import { AttendanceService } from './attendance.service';
 
 describe('AttendanceService', () => {
   beforeEach(() => {
     TestBed.configureTestingModule({
-      providers: [VoucherService],
+      imports: [HttpClientModule],
+      providers: [AttendanceService],
     });
   });
 
-  it('should be created', inject([VoucherService], (service: VoucherService) => {
+  it('should be created', inject([AttendanceService], (service: AttendanceService) => {
     expect(service).toBeTruthy();
   }));
 });