third_party: replace libmemcached Git submodule with binary package

libmemcached is a project that provides a library with implemenation of
memcached protocol and a number of tools for working with memcached
servers. memcached uses memcapable [1] that checks memcached server
implemenation for conformance with memcached protocol. libmemcached
available as binary packages on Ubuntu (memcapable is in
libmemcached-tools, see [2]) and no reasons to keep libmemcached as a Git
submodule and spend time on it's compilation and maintenance.

1. https://docs.libmemcached.org/bin/memcapable.html
2. https://packages.ubuntu.com/focal/libmemcached-tools

Closes #90

.github/workflows/testing.yaml

@@ -29,7 +29,7 @@ jobs:
           tarantool-version: ${{ matrix.tarantool-version }}
 
       - name: Install build requirements
-        run: sudo apt-get -y install libsasl2-dev
+        run: sudo apt-get -y install libsasl2-dev libmemcached-tools
 
       - run: cmake .
 

.gitmodules

@@ -1,7 +1,3 @@
-[submodule "third_party/libmemcached"]
-	path = third_party/libmemcached
-	url = https://github.com/tarantool/libmemcached.git
-	branch = libmemcached-1.2-devel-bigbes
 [submodule "test-run"]
 	path = test-run
 	url = https://github.com/tarantool/test-run.git

CMakeLists.txt

@@ -55,9 +55,7 @@ if(NOT SMALL_FOUND)
 endif()
 include_directories(${SMALL_INCLUDE_DIRS})
 
-include(cmake/BuildLibmemcached.cmake)
 include(cmake/BuildMemtier.cmake)
-libmemcached_build()
      memtier_build()
 
 include_directories(${CMAKE_SOURCE_DIR}/third_party)

test/CMakeLists.txt

@@ -4,4 +4,3 @@ add_dependencies(test-memcached internalso)
 
 add_custom_target(test-memcached-capable
         COMMAND ${CMAKE_SOURCE_DIR}/test/test-run.py --suite capable)
-add_dependencies(test-memcached-capable libmemcached)

test/capable/capable-binary.test.py

@@ -17,7 +17,7 @@
 mc = MemcachedBinaryConnection("127.0.0.1", iproto.py_con.port)
 mc.flush()
 
-cmd = shlex.split('capable/memcapable -b -p %s -h %s -v' %
+cmd = shlex.split('memccapable -b -p %s -h %s -v' %
         (iproto.py_con.port, '127.0.0.1'))
 
 task = Popen(cmd, stdout=PIPE, stderr=STDOUT)

test/capable/capable-text.test.py

@@ -17,7 +17,7 @@
 mc = MemcachedBinaryConnection("127.0.0.1", iproto.py_con.port)
 mc.flush()
 
-cmd = shlex.split('capable/memcapable -a -p %s -h %s -v' %
+cmd = shlex.split('memccapable -a -p %s -h %s -v' %
         (iproto.py_con.port, '127.0.0.1'))
 
 task = Popen(cmd, stdout=PIPE, stderr=STDOUT)