Fixed vip-init incompatibility with Powershell v1.0.

Powershell 1.0 does not support the shorthand `-lt 3` used in the for
loop. Swapping that out for `$i -lt 3`.
Adding better failure message for SVN credential verification.

Added a nicer failure message that mirrors the linux vip-init script when
a user enters an incorrect password more than once. See 8230b7f