Relicense Repository - EPL+Apache

[MarkAckert]

As this repository contains sample source code intended to be downloaded and expanded upon, it would be better suited with an EPL+Apache 2.0 dual license.

The OMP Governing Board has approved EPL-2.0 license waivers for sample repositories in Zowe, replaced by the dual license.

To re-license this repository, all contributors should consent by responding to this issue in the affirmative.

[MarkAckert]

Plus @reetchow @raymondyanli as you are listed as contributors on this repository.

[1000TurquoisePogs]

See https://github.com/zowe/sample-spring-boot-api-service/blob/master/LICENSE