introduce extra wait time for flaky mssql 2019

sshpiperd/e2e/docker-compose.yml

@@ -137,6 +137,7 @@ services:
     environment:
       - "WAIT_HOST=mssql"
       - "WAIT_PORT=1433"
+      - "EXTRA_WAIT=5"
       - "SSHPIPERD_UPSTREAM_DRIVER=mssql"
       - "SSHPIPERD_UPSTREAM_MSSQL_HOST=mssql"
       - "SSHPIPERD_UPSTREAM_MSSQL_PASSWORD=yourStrong(!)Password"
@@ -160,11 +161,11 @@ services:
       - host1
       - host2
   mssql:
-    image: mcr.microsoft.com/mssql/server:2017-CU12-ubuntu
+    image: mcr.microsoft.com/mssql/server
     environment:
       - "ACCEPT_EULA=y"
       - "SA_PASSWORD=yourStrong(!)Password"
-      # - "MSSQL_PID=Developer"
+      - "MSSQL_PID=Developer"
 
     #tmpfs:
     #  - /var/opt/mssql/data

sshpiperd/e2e/piper.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 if [ ! -z $WAIT_HOST ]; then
-    /wait.sh $WAIT_HOST $WAIT_PORT
+    /wait.sh $WAIT_HOST $WAIT_PORT $EXTRA_WAIT
 fi
 
 /sshpiperd pipe add -n host1 -u host1 --upstream-username root

sshpiperd/e2e/wait.sh

@@ -7,3 +7,7 @@ for i in `seq 300`; do
     fi
     sleep 1
 done
+
+if [ -n "$3" ]; then 
+    sleep $3; 
+fi