kfctl generate won't succeed if first attempt failed

[jlewi]

kfctl generate failed for me as follows

kfctl generate all
INFO[0000] generating kubeflow application              
ERRO[0002] couldn't generate KfApp: could not generate kssonnet under ks_app Error: Email is not set in default nor passed.

I then retry and specify the flag

/home/jlewi/git_kubeflow/bootstrap/bin/kfctl generate all --email=jlewi@google.com
INFO[0000] generating kubeflow application              
ERRO[0000] couldn't generate KfApp: could not generate deployment manager configs under gcp_config Error: cannot create directory mkdir /home/jlewi/git_kubeflow-dev/kubeflow-deployments/jlewi-0307-basic/gcp_config: file exists 

We should fix this. The desired behavior would be I should be able to rerun and specify the parameters and have it succeed.

/cc @kunmingg @gabrielwen @lluunn

[gabrielwen]

yea, I think we should check if email exists before creating directory.

[gabrielwen]

/assign @gabrielwen