Add DisasterRecovery mode to manifests when running storkctl create clusterpair

[Ben10k]

Is this a BUG REPORT or FEATURE REQUEST?:
FEATURE REQUEST

What happened:
storkctl generate clusterpair has a flag (--storageoptions) to add additional storage options, for example
mode=DisasterRecovery.

storkctl generate clusterpair does not have any way to add that storage option to the manifests before they are
applied.

What you expected to happen:
A way to provide the storageoption mode=DisasterRecovery to storkctl create clusterpair

How to reproduce it (as minimally and precisely as possible):
2 Portworx enabled kubernetes clusters are required

Required variables:

Variable	Meaning
DST_KUBE_CONFIG	Path to a kubeconfig file where current context is the destination cluster
DESTINATION_IP	IP address of the destination cluster's Portworx loadbalancer
DESTINATION_TOKEN	Token of the destination Portworx cluster, can be retrieved by running on /opt/pwx/bin/pxctl cluster token show on the cluster
SRC_KUBE_CONFIG	Path to a kubeconfig file where current context is the source cluster
SOURCE_IP	IP address of the source cluster's Portworx loadbalancer
SOURCE_TOKEN	Token of the source Portworx cluster

To generate clusterpair manifests, use this:

storkctl generate clusterpair generated-prod-to-dr \
  --kubeconfig $DST_KUBE_CONFIG \
  --namespace default \
  --storageoptions "ip=$DESTINATION_IP,token=$DESTINATION_TOKEN,mode=DisasterRecovery" \
  >generated-prod-to-dr.yaml

storkctl generate clusterpair generated-dr-to-prod \
  --kubeconfig $SRC_KUBE_CONFIG \
  --namespace default \
  --storageoptions "ip=$SOURCE_IP,token=$SOURCE_TOKEN,mode=DisasterRecovery" \
  >generated-dr-to-prod.yaml

To create and get back the yaml use this

storkctl create clusterpair created \
  -n default \
  --src-kube-file $SRC_KUBE_CONFIG \
  --src-ip $SOURCE_IP \
  --src-token $SOURCE_TOKEN \
  --dest-kube-file $DST_KUBE_CONFIG \
  --dest-ip $DESTINATION_IP \
  --dest-token $DESTINATION_TOKEN

kubectl get clusterpairs.stork.libopenstorage.org created \
  --kubeconfig $SRC_KUBE_CONFIG \
  -o yaml \
  >created-prod-to-dr.yaml

kubectl get clusterpairs.stork.libopenstorage.org created \
  --kubeconfig $DST_KUBE_CONFIG \
  -o yaml \
  >created-dr-to-prod.yaml

Anything else we need to know?:

Environment:

• Kubernetes version (use kubectl version): N/A
• Cloud provider or hardware configuration: N/A
• OS (e.g. from /etc/os-release): N/A
• Kernel (e.g. uname -a): N/A
• Install tools: N/A
• Others: