support concurrent server creation

[nicolai86]

instead of blocking for the entire resource creation duration, only
block for the actual call to create/ update the scaleway_server
resource; do not block while polling for the resource state.

this should speed up creating multiple servers considerably.

according to @sieben this should be safe now.

closes #65

[nicolai86]

all tests are green so I'm pulling this in optimistically.

[meyskens]

Not sure if related but since this was released i tried to create 3 servers and every time only 1/3 booted the rest set itself to an off state, went back to 1.4.1 and it worked fine. If you prefer i can make a seperate issue for this.

[nicolai86]

@meyskens this is most definitively related. I’m so sorry - can you create a new issue to track this?

[nicolai86]

@meyskens if you open a bug please include a template which has this issue - I tried reproducing it locally with this template, but it worked without any issues:

provider "scaleway" {}

resource "scaleway_server" "base" {
  name = "test"

  count = 5
  image = "5faef9cd-ea9b-4a63-9171-9e26bec03dbc"
  type  = "C1"
  tags  = ["terraform-test"]
}

[nicolai86]

after some digging it seems to be related to scaleway_volume_attachment usage. investigating further...