Fix inconsistencies in goal long arguments.

[derbear]

Subject of the issue

Some goal commands accept addr while others accept address as long-form arguments.

Your environment

• Software version: algod -v: 1.0.39516.dev [master] (commit #db5c6d56+)

• Operating System: Any

Steps to reproduce

goal account balance shows -a, --address string Account address to retrieve balance (required)
while
goal account delete shows -a, --addr string Address of account to delete

Expected behaviour

The long-form options should either both be --address or --addr.

Actual behaviour

One of the options is --address and the other is --addr.

[rotemh]

Fixed by #147