Disable router build and tests

The tests are flaky.  But really, we don't need the router at all.
MySQL's deb and rpm builds don't build the router.  Our Vitess containers
don't have mysqlrouter installed.  Let's speed up the builds and stablize
the tests by just excluding it.

Author: piki

build.sh

@@ -36,11 +36,12 @@ cmake \
   -DWITH_INNODB_MEMCACHED=1 \
   -DWITH_MECAB=system \
   -DWITH_NUMA=ON \
+  -DWITH_ROUTER=OFF \
   ..
 
 make -j $(nproc)
 
-DISABLE_IPV6_TESTS=1 DISABLE_TMPFILE_TESTS=1 make test ARGS="-j $(nproc) -VV"
+DISABLE_IPV6_TESTS=1 DISABLE_TMPFILE_TESTS=1 make test ARGS="-j $(nproc) -E ^routertest -VV"
 
 strip -g runtime_output_directory/mysql*