2to3 should have a way to disable some fixers

[bhy]

BPO	2956
Nosy	@benjaminp
Files	fixer_skip.diff fixer_skip2.diff

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2008-10-13.21:30:40.714>
created_at = <Date 2008-05-24.10:28:45.003>
labels = ['type-feature', 'expert-2to3']
title = '2to3 should have a way to disable some fixers'
updated_at = <Date 2008-10-13.21:30:40.704>
user = 'https://bugs.python.org/bhy'

bugs.python.org fields:

activity = <Date 2008-10-13.21:30:40.704>
actor = 'benjamin.peterson'
assignee = 'collinwinter'
closed = True
closed_date = <Date 2008-10-13.21:30:40.714>
closer = 'benjamin.peterson'
components = ['2to3 (2.x to 3.x conversion tool)']
creation = <Date 2008-05-24.10:28:45.003>
creator = 'bhy'
dependencies = []
files = ['10425', '10426']
hgrepos = []
issue_num = 2956
keywords = ['patch']
message_count = 3.0
messages = ['67289', '67292', '74697']
nosy_count = 4.0
nosy_names = ['collinwinter', 'benjamin.peterson', 'gpolo', 'bhy']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue2956'
versions = ['Python 3.0']

[bhy]

Sometime we need to enable all fixers but one or two, eg. the 'import'
fixer. So it would be fine if there's a way to do that.

[gpolo]

Once I wanted this too. I'm attaching two patches but I prefer the
former which allows the skipped fixer(s) to be logged.

[benjaminp]

Done in r66885.