waiter.ts circular dependency

[AaronDabney]

Circular Dependency

lib/common/index.ts <-> lib/common/lib/waiter.ts

1. index.ts imports from waiter.ts

import {
  DelayStrategy,
  TerminationStrategy,
  ExponentialBackoffDelayStrategy,
  MaxTimeTerminationStrategy,
  genericWaiter,
  genericTerminalConditionWaiter,
  WaiterConfiguration,
  MaxAttemptsTerminationStrategy,
  FixedTimeDelayStrategy
} from "./lib/waiter";

2. waiter.ts imports index.ts

import { OciError } from "..";

Fix proposed: #392