tests: retry to fire up VMs on vagrant failure

Add a script to retry several times to fire up VMs to avoid vagrant
failures.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>
Co-authored-by: Andrew Schoen <aschoen@redhat.com>
(cherry picked from commit 1ecb3a9352)

tests/scripts/vagrant_up.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+retries=0
+until [ $retries -ge 5 ]
+do
+  echo "Attempting to start VMs. Attempts: $retries"
+  timeout 10m vagrant up "$@" && break
+  retries=$[$retries+1]
+  sleep 5
+done
+
+sleep 10

tox.ini

@@ -423,7 +423,7 @@ changedir=
   lvm_auto_discovery: {toxinidir}/tests/functional/lvm-auto-discovery{env:CONTAINER_DIR:}
 
 commands=
-  vagrant up --no-provision {posargs:--provider=virtualbox}
+  bash {toxinidir}/tests/scripts/vagrant_up.sh --no-provision {posargs:--provider=virtualbox}
   bash {toxinidir}/tests/scripts/generate_ssh_config.sh {changedir}
 
   # configure lvm