travis: adjust MySQL config

Fixes #3021

Author: julienschmidt

Diff for: .travis.yml

@@ -12,6 +12,12 @@ before_install:
   - go get golang.org/x/tools/cmd/cover
   - go get github.com/mattn/goveralls
 
+before_script:
+  - echo -e "[server]\ninnodb_log_file_size=256MB\ninnodb_buffer_pool_size=512MB\nmax_allowed_packet=16MB" | sudo tee -a /etc/mysql/my.cnf
+  - sudo service mysql restart
+  - .travis/wait_mysql.sh
+  - mysql -e 'create database gotest;'
+
 matrix:
   include:
     - env: DB=MYSQL57
@@ -80,9 +86,6 @@ matrix:
         - export MYSQL_TEST_ADDR=127.0.0.1:3307
         - export MYSQL_TEST_CONCURRENT=1
 
-
-before_script:
-  - mysql -e 'create database gotest;'
 script:
   - go test -v -covermode=count -coverprofile=coverage.out
   - go vet ./...