(POOLER-198) Fix otel warning: Bump otel gems to 0.17.0

[yachub]

Resolves the following errors related to the opentelemetry-sdk gem:

warning: thread "Ruby-0-Thread-1: /usr/local/bundle/gems/opentelemetry-sdk-0.15.0/lib/opentelemetry/sdk/trace/export/batch_span_processor.rb:179" terminated with exception (report_on_exception is true):
NoMethodError: undefined method `export' for #<Hash:0x61159131>
   export_batch at /usr/local/bundle/gems/opentelemetry-sdk-0.15.0/lib/opentelemetry/sdk/trace/export/batch_span_processor.rb:186
    synchronize at org/jruby/ext/thread/Mutex.java:164
   export_batch at /usr/local/bundle/gems/opentelemetry-sdk-0.15.0/lib/opentelemetry/sdk/trace/export/batch_span_processor.rb:186
           work at /usr/local/bundle/gems/opentelemetry-sdk-0.15.0/lib/opentelemetry/sdk/trace/export/batch_span_processor.rb:169
           loop at org/jruby/RubyKernel.java:1442
           work at /usr/local/bundle/gems/opentelemetry-sdk-0.15.0/lib/opentelemetry/sdk/trace/export/batch_span_processor.rb:158
  reset_on_fork at /usr/local/bundle/gems/opentelemetry-sdk-0.15.0/lib/opentelemetry/sdk/trace/export/batch_span_processor.rb:179
2021-08-21 13:01:45 - NoMethodError - undefined method `each' for "DEUEUQ":String:
	/usr/local/bundle/gems/vmpooler-1.1.0/lib/vmpooler/api/v1.rb:145:in `block in fetch_single_vm'

And addresses breaking changes due to open-telemetry/opentelemetry-ruby#600 (should have released in 0.14.0?)

Full changelog from 0.15.0 to 0.17.0: open-telemetry/opentelemetry-ruby@opentelemetry-sdk/v0.15.0...opentelemetry-sdk/v0.17.0