"Parameter foreman-plugin-discovery-tftp-root invalid: true is not one of regexes matching /^(([a-zA-Z]:[\\\/])|([\\\/Error during configuration, exiting" while performing Red Hat Satellite upgrade precheck from 6.2 to 6.3

Issue

• Red Hat Satellite upgrade from 6.2 to 6.3 precheck command is failing while performing precheck for TFTP.
• Receiving below error while doing pre-upgrade check upgrade from Satellite 6.2 to Satellite 6.3:

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Procedures::Installer::Upgrade: 
Parameter foreman-plugin-discovery-tftp-root invalid: true is not one of regexes matching /^(([a-zA-Z]:[\\\/])|([\\\/Error during configuration, exiting
                                                                      [FAIL]
Failed executing LANG=en_US.utf-8 satellite-installer --upgrade, exit status 21
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Scenario [Migration scripts to Satellite 6.3] failed.

The following steps ended up in failing state:

  [installer-upgrade]

Resolve the failed steps and rerun