opentracing-cpp-1.6.0-bp154.1.20

- Update to v1.6.0
  * Implements CPack for easy RPM building
  * Support copying span contexts
  * Fix error code comparisons
  * Directly support opentracing::string_view as a Value
  * Support specifying timestamp with Log
  * Support accessing IDs
  * Support querying to see if a tracer is registered
  * Specialize conversion between time points of the same clock
- from v1.5.1
  * Fix error handling for dynamic loading

- Add source package, which is needed to fix envoy-proxy.
  (boo#1129568)

- Update to 1.5.0
  * Introduce ABI versioning
- Remove devel-static package and disable static linking
- Remove cmake-lib-install-dir.patch - accepted upstream
- Move docs to libopentracing-cpp1 package

- Fix RPM groups, edit description for better grammar.

- Make use of %license macro

- Fix ldconfig calls

- Initial commit