Update install.sh to use a fixed version of minio

src/test/clmctest/services/minio/install.sh

@@ -47,6 +47,8 @@ cd /usr/local/go/src/github.com/minio
 git clone https://github.com/minio/minio
 
 cd minio
+# fix the minio version
+git checkout tags/RELEASE.2019-03-27T22-35-21Z
 go install -v -ldflags "$(go run buildscripts/gen-ldflags.go)"
 
 # check minio configuration available