[tor-bugs] #17020 [Tor]: Add test for Config options_act function

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#17020: Add test for Config options_act function
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 Reporter:  tcz001                               |          Owner:
     Type:  enhancement                          |         Status:
 Priority:  Medium                               |  needs_revision
Component:  Tor                                  |      Milestone:  Tor:
 Severity:  Normal                               |  0.2.8.x-final
 Keywords:  testing, TorCoreTeam201509,          |        Version:
  028-triaged, pre028-patch                      |     Resolution:
Parent ID:                                       |  Actual Points:
  Sponsor:  SponsorS                             |         Points:  small
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Comment (by tcz001):

 The latest two commits fix the failure when --enable-gcc-warnings.
 https://github.com/twstrike/tor/tree/test_config_options_act
 [7acdad](https://github.com/twstrike/tor/commit/7acdadae6c97f9b5283bc2a48ec3f8677abd0d4a)
 [a64adc](https://github.com/twstrike/tor/commit/a64adcc0618ae4226ed2335b2335adad1bd2de71)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17020#comment:16>
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