Version of pivnet-cli in pcfnorm/rootfs doesn't support refresh tokens

[crsimmons]

Issue

pcfnorm/rootfs image used in many tasks has a really old version of pivnet-cli (v0.0.49) which doesn't support UAA refresh tokens. It needs to be upgraded to at least v0.0.50 for this to work (latest is v0.0.55).

Expected result

# pivnet-cli login --api-token=<refresh token>
Logged-in successfully

Current result

# pivnet-cli login --api-token=<refresh token>
Failed to login

Steps to Reproduce

docker run -it pcfnorm/rootfs bash then try the above command

[cf-gitbot]

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