Allow user to set resources' source when creating a resource via the rest API

[machi1990]

At the moment it is not possible to set the source when creating a resource via a restful API.
This makes watching the resources created via the rest API impossible.

@qiujian16 @clyang82 following discussions we've two options:

1. setting the source as maestro by default
2. allow user to specify the resource's source

[clyang82]

Have a PR to set the source as maestro by default. @machi1990 are you fine with this option?

[machi1990]

Thanks @clyang82

With this I'll be able to subscribe to status changes by specifying maestro as the source, correct?

[clyang82]

Yes. You are right. You can get resource by using ocm get /api/maestro/v1/resources -p search="source = 'maestro'"

[clyang82]

@machi1990 are you fine with the default source as maestro? if so, the PR was merged. Please give a try and then close this issue. Thanks.

[machi1990]

Thanks for this.