libmemcached: add MEMCACHED_BEHAVIOR_META_PROTOCOL

[m6w6]

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 70.92338% with 148 lines in your changes missing coverage. Please review.

Project coverage is 68%. Comparing base (bcc1a6e) to head (81b2016). Report is 46 commits behind head on v1.x.

Files	Patch %	Lines
src/libmemcached/response.cc	65%	64 Missing :warning:
src/libmemcached/get.cc	75%	20 Missing :warning:
src/libmemcached/delete.cc	22%	18 Missing :warning:
src/libmemcached/storage.cc	72%	13 Missing :warning:
src/libmemcached/auto.cc	76%	9 Missing :warning:
src/libmemcached/touch.cc	63%	7 Missing :warning:
test/lib/ReturnMatcher.cpp	14%	6 Missing :warning:
src/bin/common/options.hpp	40%	3 Missing :warning:
src/libmemcached/behavior.cc	70%	3 Missing :warning:
src/bin/memslap.cc	0%	1 Missing :warning:
... and 4 more

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Additional details and impacted files

@@          Coverage Diff           @@
##            v1.x    #112    +/-   ##
======================================
- Coverage     68%     68%    -0%     
======================================
  Files        194     194            
  Lines      17479   17812   +333     
======================================
+ Hits       11930   12150   +220     
- Misses      5549    5662   +113     

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