TDS: Improve TDS7 Prelogin request/response handling

- Fix detection of TDS7 Prelogin responses to have fewer false positives.
  This was causing regular responses to be recognized as Prelogin responses if they
  happened to begin with a DONEINPROC token.
- Define symbolic constents for the Prelogin options.
- Apply the version_convert processing to the relevant prelogin options as well as
  to the loginack_progversion.
- Correct the display of the program version in version_convert.
- Factor out the setting of tds7_version so it can be called from the dissect_tds7_login
  as well as dissect_tds_login_ack_token. This is needed to correctly handle tokens
  which come before the loginack token in the login response.
- Fix the wording of a comment in my last commit.

Change-Id: I57615bbb1e780db37cda25d8d5d7f964f68b337e
Reviewed-on: https://code.wireshark.org/review/24664
Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com>
Tested-by: Petri Dish Buildbot
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>

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