minor fixes

[satya-dillikar]

Issue #, if available:

80 #67 #98

Description of changes: Minor fixes:

• Remove TAP-SETUP-README.md file as suggested in #80
• Unmask TanzuNetUsername & display it. As per suggestion in #67
• Update Cluster essentials to 1.2.0 as per #98

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[tlindsay42]

/do-e2e-tests