ticket28731-033 Log bootstrap tag names

[tlyu]

Add the bootstrap tag name to the log messages, so people
troubleshooting connection problems can look up a symbol instead of a
number. Closes ticket 28731.

[coveralls]

Pull Request Test Coverage Report for Build 3240

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 57.98%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/or/control.c	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/or/control.c	1	20.37%

Totals
Change from base Build 3215:	0.03%
Covered Lines:	40306
Relevant Lines:	69517

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💛 - Coveralls

[tlyu]

Closing because no backport.