Bug #50182 mtr: allow $MTR_PORT_BASE or --port-base= as alternative to MTR_BUILD_THREAD

Description:
The use of $MTR_BUILD_THREAD or --build-thread to indirectly specify port base is confusing, both in name and values. It would better to call it $MTR_PORT_BASE and --port-base and have the value be the *actual* port number.

How to repeat:
N/A

Suggested fix:
To avoid having to rewrite all the internal management of this, the port base value could be converted back to the MTR_BUILD_THREAD value. This would mean it has to be a multiple of 10, or be rounded down. Ranges are allocated in blocks of 10 anyway.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/96473

2876 Bjorn Munch	2010-01-11
      Bug #50182 mtr: allow $MTR_PORT_BASE or --port-base= as alternative to MTR_BUILD_THREAD
      As suggested, convert internally to value of build_thread

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/98028

2884 Bjorn Munch	2010-01-25
      Bug #50182 mtr: allow $MTR_PORT_BASE or --port-base= as alternative to MTR_BUILD_THREAD
       As suggested, convert internally to value of build_thread

Pushed to 5.1-mtr, trunk-mtr, next-mr-mtr, 6.0-codebase-mtr

Pushed into 6.0.14-alpha (revid:alik@sun.com-20100220092844-jh07ayojyxn8uh9p) (version source revid:bjorn.munch@sun.com-20100125123531-2dxmmczd9hfm4ye1) (merge vers: 6.0.14-alpha) (pib:16)

Pushed into 5.5.3-m2 (revid:alik@sun.com-20100220092622-wvhh1vfy5tjq4mhu) (version source revid:bjorn.munch@sun.com-20100125102422-uz803coqz5tqkhfz) (merge vers: 5.5.1-m2) (pib:16)

Pushed into mysql-next-mr (revid:alik@sun.com-20100220092730-paoo5t9gcajs5dq8) (version source revid:bjorn.munch@sun.com-20100125103031-em5g54dq400bi7sf) (pib:16)

Noted in 5.5.3, 6.0.14 changelogs.

mysql-test-run.pl has a new --portbase option and a corresponding
MTR_PORT_BASE environment variable for setting the port range, as an
alternative to the existing --build-thread option.

Setting report to Need Merge pending push to 5.1.x, Celosia.

Pushed into 5.1.45 (revid:joro@sun.com-20100301083827-xnimmrjg6bh33o1o) (version source revid:azundris@mysql.com-20100222175719-viuh0f3gdsrkgv0r) (merge vers: 5.1.45) (pib:16)

Noted in 5.1.45 changelog.

Pushed into 5.1.47-ndb-7.0.16 (revid:martin.skold@mysql.com-20100617114014-bva0dy24yyd67697) (version source revid:vasil.dimov@oracle.com-20100331130613-8ja7n0vh36a80457) (merge vers: 5.1.46) (pib:16)

Pushed into 5.1.47-ndb-6.2.19 (revid:martin.skold@mysql.com-20100617115448-idrbic6gbki37h1c) (version source revid:martin.skold@mysql.com-20100609140708-52rvuyq4q500sxkq) (merge vers: 5.1.45-ndb-6.2.19) (pib:16)

Pushed into 5.1.47-ndb-6.3.35 (revid:martin.skold@mysql.com-20100617114611-61aqbb52j752y116) (version source revid:vasil.dimov@oracle.com-20100331130613-8ja7n0vh36a80457) (merge vers: 5.1.46) (pib:16)