[TESTS] Create vagrant up task for all boxes (#22496)

Currently, such tasks are only created for default boxes (centos-7, ubuntu-1404) and not all boxes and this can be misleading for developers who want to debug testing scripts on non-default boxes.

TESTING.asciidoc

@@ -430,15 +430,33 @@ cd $BATS_ARCHIVES
 sudo -E bats $BATS_TESTS/*.bats
 -------------------------------------------------
 
-Note: Starting vagrant VM outside of the elasticsearch folder requires to
-indicates the folder that contains the Vagrantfile using the VAGRANT_CWD
-environment variable:
+You can also use Gradle to prepare the test environment and then starts a single VM:
 
 -------------------------------------------------
-gradle vagrantSetUp
-VAGRANT_CWD=/path/to/elasticsearch vagrant up centos-7 --provider virtualbox
+gradle vagrantFedora24#up
+-------------------------------------------------
+
+Or any of vagrantCentos6#up, vagrantDebian8#up, vagrantFedora24#up, vagrantOel6#up,
+vagrantOel7#up, vagrantOpensuse13#up, vagrantSles12#up, vagrantUbuntu1204#up,
+vagrantUbuntu1604#up.
+
+Once up, you can then connect to the VM using SSH from the elasticsearch directory:
+
+-------------------------------------------------
+vagrant ssh fedora-24
 -------------------------------------------------
 
+Or from another directory:
+
+-------------------------------------------------
+VAGRANT_CWD=/path/to/elasticsearch vagrant ssh fedora-24
+-------------------------------------------------
+
+Note: Starting vagrant VM outside of the elasticsearch folder requires to
+indicates the folder that contains the Vagrantfile using the VAGRANT_CWD
+environment variable.
+
+
 == Coverage analysis
 
 Tests can be run instrumented with jacoco to produce a coverage report in

buildSrc/src/main/groovy/org/elasticsearch/gradle/vagrant/VagrantTestPlugin.groovy

@@ -404,10 +404,6 @@ class VagrantTestPlugin implements Plugin<Project> {
                 args 'halt', box
             }
             stop.dependsOn(halt)
-            if (project.extensions.esvagrant.boxes.contains(box) == false) {
-                // we only need a halt task if this box was not specified
-                continue;
-            }
 
             Task update = project.tasks.create("vagrant${boxTask}#update", VagrantCommandTask) {
                 boxName box
@@ -435,6 +431,11 @@ class VagrantTestPlugin implements Plugin<Project> {
                 dependsOn update
             }
 
+            if (project.extensions.esvagrant.boxes.contains(box) == false) {
+                // we d'ont need tests tasks if this box was not specified
+                continue;
+            }
+
             Task smoke = project.tasks.create("vagrant${boxTask}#smoketest", Exec) {
                 environment vagrantEnvVars
                 dependsOn up