refactor(agent): moved crane/dagent errors to v1

[robot9706]

Crane and Dagent had almost the same errors defined for the REST interface. Moved these to the v1 common package.

[codecov-commenter]

Codecov Report

Merging #66 (ec85f71) into develop (402b401) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           develop     #66   +/-   ##
=======================================
  Coverage     6.70%   6.70%           
=======================================
  Files           58      58           
  Lines         4117    4117           
=======================================
  Hits           276     276           
  Misses        3832    3832           
  Partials         9       9           

Impacted Files	Coverage Δ
agent/pkg/api/v1/error.go	0.00% <ø> (ø)
agent/pkg/crane/controller/deploy.go	0.00% <0.00%> (ø)
agent/pkg/crane/controller/kubeapi.go	0.00% <ø> (ø)
agent/pkg/crane/controller/update.go	0.00% <0.00%> (ø)
agent/pkg/crane/docs/crane_docs.go	100.00% <ø> (ø)
agent/pkg/dagent/controller/container.go	0.00% <0.00%> (ø)
agent/pkg/dagent/controller/update.go	0.00% <0.00%> (ø)
agent/pkg/dagent/docs/dagent_docs.go	100.00% <ø> (ø)

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[nandor-magyar]

neat 😸 🌵

[polaroi8d]

LGTM, please pay attention to squash the commits.