Update docs and tests to use ignite/v1alpha3

Docs generated using `make api-docs`.

cmd/ignite/cmd/vmcmd/ps.go

@@ -23,7 +23,7 @@ func NewCmdPs(out io.Writer) *cobra.Command {
 			also list VMs that are not currently running.
 			Using the -f (--filter) flag, you can give conditions VMs should fullfilled to be displayed.
 			You can filter on all the underlying fields of the VM struct, see the documentation:
-			https://ignite.readthedocs.io/en/stable/api/ignite_v1alpha2#VM.
+			https://ignite.readthedocs.io/en/stable/api/ignite_v1alpha3#VM.
 
 			Different operators can be used:
 			- "=" and "==" for the equal

cmd/ignite/run/testdata/input/create-config-no-name.yaml

@@ -1,4 +1,4 @@
-apiVersion: ignite.weave.works/v1alpha2
+apiVersion: ignite.weave.works/v1alpha3
 kind: VM
 spec:
   image:

cmd/ignite/run/testdata/input/rm-no-name-uid.yaml

@@ -1,4 +1,4 @@
-apiVersion: ignite.weave.works/v1alpha2
+apiVersion: ignite.weave.works/v1alpha3
 kind: VM
 metadata:
   name: ""

cmd/ignite/run/testdata/input/rm-vm1.yaml

@@ -1,4 +1,4 @@
-apiVersion: ignite.weave.works/v1alpha2
+apiVersion: ignite.weave.works/v1alpha3
 kind: VM
 metadata:
   name: myvm2

cmd/ignite/run/testdata/output/inspect-json.txt

@@ -1,6 +1,6 @@
 {
   "kind": "VM",
-  "apiVersion": "ignite.weave.works/v1alpha2",
+  "apiVersion": "ignite.weave.works/v1alpha3",
   "metadata": {
     "name": "someVM",
     "uid": "1699b6ba255cde7f",

cmd/ignite/run/testdata/output/inspect-yaml.txt

@@ -1,4 +1,4 @@
-apiVersion: ignite.weave.works/v1alpha2
+apiVersion: ignite.weave.works/v1alpha3
 kind: VM
 metadata:
   created: "2000-01-01T01:00:00Z"