adds description to command schema in rundeck_job resource

[gerbenjacobs]

This change allows you to add descriptions to command/step blocks in Rundeck. This is especially nice when viewing a definition that contains multiple script steps.

[stack72]

Thanks for this @gerbenjacobs :)

This LGTM and the tests pass as expected

% make testacc TEST=./builtin/providers/rundeck                                                    ✭
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/05/11 14:29:01 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/rundeck -v  -timeout 120m
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccJob_basic
--- PASS: TestAccJob_basic (8.01s)
=== RUN   TestAccPrivateKey_basic
--- PASS: TestAccPrivateKey_basic (1.44s)
=== RUN   TestAccProject_basic
--- PASS: TestAccProject_basic (1.51s)
=== RUN   TestAccPublicKey_basic
--- PASS: TestAccPublicKey_basic (2.60s)
PASS
ok  	github.com/hashicorp/terraform/builtin/providers/rundeck	13.578s

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