fix(zfspv): rounding off the volume size to Gi and Mi (#191)

ZFS does not create the zvol if volume size is not multiple of
the volblocksize. There are use cases where customer will create
a PVC with size as 5G, which will be 5 * 1000 * 1000 * 1000 bytes
and this is not the multiple of default volblocksize 8k.

In ZFS, volblocksize and recordsize must be power of 2 from 512B to 1M,
so keeping the size in the form of Gi or Mi should be
sufficient to make volsize multiple of volblocksize/recordsize.


Signed-off-by: Pawan <pawan@mayadata.io>

.travis.yml

@@ -8,6 +8,8 @@ env:
   - MINIKUBE_HOME=$HOME
   - CHANGE_MINIKUBE_NONE_USER=true
   - KUBECONFIG=$HOME/.kube/config
+  - OPENEBS_NAMESPACE=openebs
+  - NodeID=$HOSTNAME
 services:
   - docker
 language: go