hdctools: servod: clarify errors during hwinit

BUG=chromium-os:36451
TEST=manual

1. connect servo V2 w/o 50->50 pin cable
2. sudo servod -b parrot

Failure now looks like:
    2012-11-20 10:50:31,626 - Servod - INFO - Initialized jtag_buf_en to off
    -E- :: Slave 0x26 failed wr_rd with fic->error:0 err:2
    2012-11-20 10:50:31,634 - Servod - ERROR - Problem initializing jtag_buf_on_flex_en -> off :: ('fi2c_wr_rd', 'slave:0x26 wr:[] rcnt:1 err:1')
    .
    .
    2012-11-20 10:50:31,775 - servod - CRITICAL - Problem during hardware initialization.

Change-Id: I7d7591383a146fa392f20e010c1ee130b56ef06f
Reviewed-on: https://gerrit.chromium.org/gerrit/38400
Tested-by: Todd Broch <tbroch@chromium.org>
Reviewed-by: Jeremy Thorpe <jeremyt@chromium.org>
Commit-Ready: Todd Broch <tbroch@chromium.org>
3 files changed