setting bootstrap version to 3.3

Makefile

@@ -248,7 +248,7 @@ $(PROTO_GO_OUTS): minimaltools install_protoc-gen-go proto/*.proto
 # This rule builds the bootstrap images for all flavors.
 DOCKER_IMAGES_FOR_TEST = mariadb mariadb103 mysql56 mysql57 mysql80 percona percona57 percona80
 DOCKER_IMAGES = common $(DOCKER_IMAGES_FOR_TEST)
-BOOTSTRAP_VERSION=3.2
+BOOTSTRAP_VERSION=3.3
 ensure_bootstrap_version:
 	find docker/ -type f -exec sed -i "s/^\(ARG bootstrap_version\)=.*/\1=${BOOTSTRAP_VERSION}/" {} \;
 	sed -i 's/\(^.*flag.String(\"bootstrap-version\",\) *\"[^\"]\+\"/\1 \"${BOOTSTRAP_VERSION}\"/' test.go

test.go

@@ -27,10 +27,12 @@ run against a given flavor, it may take some time for the corresponding
 bootstrap image (vitess/bootstrap:<flavor>) to be downloaded.
 
 It is meant to be run from the Vitess root, like so:
-  $ go run test.go [args]
+
+	$ go run test.go [args]
 
 For a list of options, run:
-  $ go run test.go --help
+
+	$ go run test.go --help
 */
 package main
 
@@ -74,7 +76,7 @@ For example:
 // Flags
 var (
 	flavor           = flag.String("flavor", "mysql57", "comma-separated bootstrap flavor(s) to run against (when using Docker mode). Available flavors: all,"+flavors)
-	bootstrapVersion = flag.String("bootstrap-version", "3.1", "the version identifier to use for the docker images")
+	bootstrapVersion = flag.String("bootstrap-version", "3.3", "the version identifier to use for the docker images")
 	runCount         = flag.Int("runs", 1, "run each test this many times")
 	retryMax         = flag.Int("retry", 3, "max number of retries, to detect flaky tests")
 	logPass          = flag.Bool("log-pass", false, "log test output even if it passes")