Ensure 'make generate' has been executed when model changes are made

[jpkrohling]

Closes #99

When a model has been changed but the deep copy functions haven't been changed, this is shown:

$ make ci
Run code-generation for custom resources
Generating deepcopy funcs

Build failed: a model has been changed but the deep copy functions aren't up to date. Run 'make generate' and update your PR.
make: *** [Makefile:27: ensure-generate-is-noop] Error 1

Otherwise, this is what a successful build looks like now:

$ make ci
Run code-generation for custom resources
Generating deepcopy funcs

Checking...
Formatting code...
Linting...
Building...
Running unit tests...
?   	github.com/jaegertracing/jaeger-operator/cmd	[no test files]
ok  	github.com/jaegertracing/jaeger-operator/pkg/apis/io/v1alpha1	0.063s	coverage: 15.5% of statements
?   	github.com/jaegertracing/jaeger-operator/pkg/cmd/start	[no test files]
?   	github.com/jaegertracing/jaeger-operator/pkg/cmd/version	[no test files]
ok  	github.com/jaegertracing/jaeger-operator/pkg/controller	0.010s	coverage: 100.0% of statements
ok  	github.com/jaegertracing/jaeger-operator/pkg/deployment	0.025s	coverage: 100.0% of statements
ok  	github.com/jaegertracing/jaeger-operator/pkg/ingress	0.054s	coverage: 100.0% of statements
ok  	github.com/jaegertracing/jaeger-operator/pkg/inject	0.013s	coverage: 100.0% of statements
ok  	github.com/jaegertracing/jaeger-operator/pkg/route	0.019s	coverage: 100.0% of statements
ok  	github.com/jaegertracing/jaeger-operator/pkg/service	0.008s	coverage: 100.0% of statements
ok  	github.com/jaegertracing/jaeger-operator/pkg/storage	0.025s	coverage: 100.0% of statements
?   	github.com/jaegertracing/jaeger-operator/pkg/stub	[no test files]
ok  	github.com/jaegertracing/jaeger-operator/pkg/util	0.004s	coverage: 100.0% of statements
?   	github.com/jaegertracing/jaeger-operator/pkg/version	[no test files]

Signed-off-by: Juraci Paixão Kröhling juraci@kroehling.de

[jpkrohling]

This change is 

[objectiser]

@jpkrohling Looks like the operator SDK will need to be installed before running the generate.

[codecov]

Codecov Report

Merging #101 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #101   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          21       21           
  Lines         869      869           
=======================================
  Hits          864      864           
  Misses          5        5

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[jpkrohling]

@objectiser CI is now passing, I think it's OK to merge, right?