Adds baseline IT tests for different versions of MSSQL servers

This test extends the MSSQL integration tests by adding test for
running the existing test suite against the following MSSQL server
versions:
- 2019-latest
- 2017-CU1-ubuntu
in addition to the `2017-latest` version that is used in the existing
test.

Addresses serverless-broker Issue #1017.

test/connector/tcp/mssql/server-2017-CU1/dev

@@ -0,0 +1,3 @@
+#!/bin/bash -ex
+
+./start -d

test/connector/tcp/mssql/server-2017-CU1/docker-compose.override.yml

@@ -0,0 +1,5 @@
+version: '3.0'
+
+services:
+  mssql:
+    image: mcr.microsoft.com/mssql/server:2017-CU1-ubuntu

test/connector/tcp/mssql/server-2017-CU1/start

@@ -0,0 +1,13 @@
+#!/bin/bash -ex
+
+dev_mode_flag=
+while getopts ":d" opt; do
+    case $opt in
+        d) dev_mode_flag="-d";;
+        *) echo "Unknown option -$OPTARG"; exit 1;;
+    esac
+done
+
+save_dir=$(pwd)
+cd ..
+./start -f $save_dir/docker-compose.override.yml $dev_mode_flag

test/connector/tcp/mssql/server-2017-CU1/stop

@@ -0,0 +1,4 @@
+#!/bin/bash -ex
+
+cd ..
+./stop

test/connector/tcp/mssql/server-2017-CU1/test

@@ -0,0 +1,4 @@
+#!/bin/bash -ex
+
+cd ..
+./test

test/connector/tcp/mssql/server-2019/dev

@@ -0,0 +1,3 @@
+#!/bin/bash -ex
+
+./start -d

test/connector/tcp/mssql/server-2019/docker-compose.override.yml

@@ -0,0 +1,5 @@
+version: '3.0'
+
+services:
+  mssql:
+    image: mcr.microsoft.com/mssql/server:2019-latest

test/connector/tcp/mssql/server-2019/start

@@ -0,0 +1,13 @@
+#!/bin/bash -ex
+
+dev_mode_flag=
+while getopts ":d" opt; do
+    case $opt in
+        d) dev_mode_flag="-d";;
+        *) echo "Unknown option -$OPTARG"; exit 1;;
+    esac
+done
+
+save_dir=$(pwd)
+cd ..
+./start -f $save_dir/docker-compose.override.yml $dev_mode_flag

test/connector/tcp/mssql/server-2019/stop

@@ -0,0 +1,4 @@
+#!/bin/bash -ex
+
+cd ..
+./stop

test/connector/tcp/mssql/server-2019/test

@@ -0,0 +1,4 @@
+#!/bin/bash -ex
+
+cd ..
+./test

test/connector/tcp/mssql/start

@@ -1,19 +1,39 @@
 #!/bin/bash -ex
 
-SECRETLESS_HOST=secretless
-while getopts :d opt; do
+secretless_host="secretless"
+while getopts ":df:h" opt; do
     case $opt in
-        d) SECRETLESS_HOST=secretless-dev;;
-       \?) echo "Unknown option -$OPTARG"; exit 1;;
+        d) secretless_host="secretless-dev";;
+        f) docker_override_file=${OPTARG};;
+        h) help_and_exit 0;;
+        *) echo "Unknown option -$OPTARG"; exit 1;;
     esac
 done
+if [ -n "$docker_override_file" ]; then
+    override_args="-f $docker_override_file"
+fi
+
+help_and_exit() {
+  local retval=${1:-1}
+  cat <<EOF
+This script starts up an MSSQL server container and a secretless
+broker container.
+
+Options:
+  -d Run in development mode.
+  -f <docker-compose-override-file>
+     Docker compose override file.
+  -h Show this command usage
+EOF
+  exit "$retval"
+}
 
 ./stop
 
 # the order of the services is important. mssql must be up before we start secretless
-docker-compose up -d mssql
+docker-compose -f docker-compose.yml $override_args up -d mssql
 
 time ./wait_for_mssql
 docker-compose logs mssql
 
-docker-compose up -d $SECRETLESS_HOST
+docker-compose up -d $secretless_host