Add option to take credentials from kubernetes secrets about falcon HOT 4 OPEN

@runitmisra Please proceed with the required changes and make a pull request. Also, update the relevant read-me and sample scripts.

May be we should be having a mechanism to setup required secrets in the start of setup. Or possible auto secret generation.

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@runitmisra Use a single secret for all identity registration under a CA rather than creating individual secrets for every identities. Otherwise we will end-up with 100+ secrets for the TLSCA.

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@jithindevasia can't we dynamically generate the secrets and it's value. (From a security standpoint let all identities be using a unique secret)

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@jithindevasia can't we dynamically generate the secrets and it's value. (From a security standpoint let all identities be using a unique secret)

Managing/Creating secrets from falcon will lead us to use any cli actions like kubectl or something which will be platform dependent then. I prefer to leave the secret creation/management outside falcon. So people can have their own way to manage secrets.

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