deploy: unify and simplify deployment scripts

Conceptually, each deployment can have its own script. This may become
relevant at some point, so the CI looks for the script in the
individual directories.

But in practice the current two copies of the script were
identical. It makes sense to keep only a single copy in a neutral
place and use it via symlinks.

While at it, the unused CRD installation gets removed. It's definitely
not needed for 1.14 (no CRDs) and should not be needed for
1.13 (cluster setup must install them).

Author: pohly

README.md

@@ -64,11 +64,6 @@ deploying snapshotclass
 volumesnapshotclass.snapshot.storage.k8s.io/csi-hostpath-snapclass created
 ```
 
-The script can also install CRDs that are needed for alpha features,
-but as this is something that should be done by the cluster
-provisioning tool it is disabled in the script by default. For this
-and other customizations see the source code of the deploy script.
-
 The [livenessprobe side-container](https://github.com/kubernetes-csi/livenessprobe) provided by the CSI community is deployed with the CSI driver to provide the liveness checking of the CSI services.
 
 ## Run example application and validate

deploy/kubernetes-1.13/deploy-hostpath.sh

@@ -0,0 +1 @@
+../util/deploy-hostpath.sh

deploy/kubernetes-1.13/deploy-hostpath.sh

@@ -0,0 +1 @@
+../util/deploy-hostpath.sh