Imperative Event Emitter error when running system tests

[t1m0thyj]

When developing a CLI plug-in that uses @zowe/cli-test-utils, after updating to the latest vNext prerelease, then running multiple system tests in parallel fails with the following error:

• Test suite failed to run

  Only one instance of the Imperative Event Emitter is allowed

  at Function.initialize (node_modules/@zowe/imperative/src/events/src/ImperativeEventEmitter.ts:34:19) at Function. (node_modules/@zowe/imperative/src/config/src/Config.ts:158:32) at node_modules/@zowe/imperative/lib/config/src/Config.js:18:71 at Object..__awaiter (node_modules/@zowe/imperative/lib/config/src/Config.js:14:12) at Function.load (node_modules/@zowe/imperative/lib/config/src/Config.js:84:16) at Function. (node_modules/@zowe/cli-test-utils/lib/environment/TempTestProfiles.js:208:70) at step (node_modules/@zowe/cli-test-utils/lib/environment/TempTestProfiles.js:66:23) at Object.next (node_modules/@zowe/cli-test-utils/lib/environment/TempTestProfiles.js:47:53)

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