update otel-collector example

[stefanprisca]

Addressing issue #991

There were two main issues with the example:

1. It was using an old name for the jaeger exporter (see 760)

• Solution: changed_ the exporter name to "jaeger"

2. The otel collector expects tls connections to exporters by default (see 1191)

• Solution: added the "insecure: true" setting to the jaeger exporter.

Additional changes:

• Since the commonLabels attributes were being used for metrics, I thought it might be nice to use them in the traces as well, to show this use-case also.
• Bumped the collector version to latest verified version 0.6.0