Add skip preflight check flag

[aniruddha2000]

fixes #211

[k8s-ci-robot]

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[aniruddha2000]

ServiceAccount conformance-serviceaccount already exist, please run --cleanup first. I am getting this @BenTheElder @rjsadow should we also do the same approach as namespace?

[rjsadow]

ServiceAccount conformance-serviceaccount already exist, please run --cleanup first. I am getting this @BenTheElder @rjsadow should we also do the same approach as namespace?

Yes, we'll need to cleanup any namespaced resources.

[aniruddha2000]

@rjsadow i meant as we are reusing the namespace, could we reuse the named resources as well? if we do a cleanup here then there is no point of reusing the namespace because --cleanup also removes the namespace as well I believe.

[aniruddha2000]

@rjsadow i will sqush it later

[rjsadow]

/lgtm
/hold remove when you're ready to merge

[rjsadow]

/lgtm