PXD-2480 ⁃ config parsing is not robust

[rudyardrichter]

https://github.com/uc-cdis/cdis-data-client/blob/master/gen3-client/jwt/configure.go#L116
prone to failure

[zflamig]

Suggest replacing with https://github.com/go-ini/ini

[mfshao]

will plan for the next sprint maybe