[DOCS] Fix list formatting in TESTING.asciidoc
Fix the steps listed  in `Testing packaging` to
```
1. step1
2. step2
vagrant plugin install vagrant-cachier
3. step3
```
instead of
```
instead of:
1. step1
2. step2
vagrant plugin install vagrant-cachier
1. step3
```
@@ -350,26 +350,26 @@ and running elasticsearch distributions works correctly on supported operating s
These tests should really only be run in vagrant vms because they're destructive.
. Install Virtual Box and Vagrant.
-
++
. (Optional) Install https://github.com/fgrehm/vagrant-cachier[vagrant-cachier] to squeeze
a bit more performance out of the process:
-
++
--------------------------------------
vagrant plugin install vagrant-cachier
--------------------------------------
-
++
. Validate your installed dependencies:
-
++
-------------------------------------
./gradlew :qa:vagrant:vagrantCheckVersion
-------------------------------------
-
++
. Download and smoke test the VMs with `./gradlew vagrantSmokeTest` or
`./gradlew -Pvagrant.boxes=all vagrantSmokeTest`. The first time you run this it will
download the base images and provision the boxes and immediately quit. Downloading all
the images may take a long time. After the images are already on your machine, they won't
be downloaded again unless they have been updated to a new version.
-
++
. Run the tests with `./gradlew packagingTest`. This will cause Gradle to build
the tar, zip, and deb packages and all the plugins. It will then run the tests
on ubuntu-1404 and centos-7. We chose those two distributions as the default
