Added capability of detecting the platform

[jpkrohling]

Fixes #133 by implementing a way of detecting when we are running in OpenShift. If a "route" resource cannot be found, we assume we are running in Kubernetes.

When running in OpenShift, this is th expected output:

$ make run
customresourcedefinition.apiextensions.k8s.io/jaegers.io.jaegertracing created
INFO[0000] Go                                            arch=amd64 os=linux version=go1.11.1
INFO[0000] operator-sdk                                  version=v0.4.1
DEBU[0000] Attempting to auto-detect the platform       
INFO[0000] Auto-detected the platform                    platform=openshift

And this is the expected output for Kubernetes:

$ make run
customresourcedefinition.apiextensions.k8s.io/jaegers.io.jaegertracing created
INFO[0000] Go                                            arch=amd64 os=linux version=go1.11.1
INFO[0000] operator-sdk                                  version=v0.4.1
DEBU[0000] Attempting to auto-detect the platform       
INFO[0000] Auto-detected the platform                    platform=kubernetes

This PR also removes the content about --platform=openshift, which is still available to override the auto-detect routine.

[jpkrohling]

This change is 

[codecov]

Codecov Report

Merging #217 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #217   +/-   ##
=======================================
  Coverage   95.18%   95.18%           
=======================================
  Files          35       35           
  Lines        1848     1848           
=======================================
  Hits         1759     1759           
  Misses         75       75           
  Partials       14       14

Impacted Files	Coverage Δ
pkg/apis/io/v1alpha1/jaeger_types.go	100% <ø> (ø)	⬆️

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