All namespaces and headers that use transparent_auth to authservice

[neilong31]

Fixes #45 Any time I saw transparent_auth as a header, namespace, or in the comments I changed it to authservice in both the src and test folders. I also followed the same coding conventions.

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[istio-testing]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[nickrmc83]

@neilong31 The changes look good and thanks for the PR. You need to sign-off your commit and make sure you have a valid google CLA (see failure details links). Once you've fixed those issues I'll merge.

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[neilong31]

Thanks! I have signed-off on my commit and filled out my google CLA.

[nickrmc83]

/lgtm