Upgrade nebula.netflixoss to replace bintray publication and update TravisCI Secrets

[rpalcolea]

Hi folks,

As you might be aware, JFrog is sunsetting Bintray and JCenter: https://jfrog.com/blog/into-the-sunset-bintray-jcenter-gocenter-and-chartcenter/

This upgrades to Nebula NetflixOSS which will publish to Nebula's OSS repos and Maven Central.

Repositories based on status:

• https://netflixoss.jfrog.io/artifactory/maven-oss-snapshots
• https://netflixoss.jfrog.io/artifactory/maven-oss-candidates
• https://netflixoss.jfrog.io/artifactory/maven-oss-releases

[troshko111]

I can do a release (there are unreleased changes) to try this out, would appreciate if you could help verify.

[rpalcolea]

yeah that makes sense, I can verify that everything goes as expected

[troshko111]

@rpalcolea kicked off https://github.com/Netflix/eureka/releases/tag/v1.10.13

[rpalcolea]

Alright I see https://repo1.maven.org/maven2/com/netflix/eureka/eureka-core/1.10.13/ in maven central

and also in our repo: https://repo1.maven.org/maven2/com/netflix/eureka/eureka-core/1.10.13/

Same for other modules such as:

https://repo1.maven.org/maven2/com/netflix/eureka/eureka-server/1.10.13/
https://repo1.maven.org/maven2/com/netflix/eureka/eureka-client/1.10.13/