Switch to installing collection inside tox target

Instead of working around with symbolic links, we can simply just
do the installation instead inside the tox target.

Sem-Ver: bugfix
Change-Id: Ie46b6ea0aed75f512b704e4892ab07d71db62d1a
diff --git a/tox.ini b/tox.ini
index 5e6e482..5ce257a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -22,6 +22,9 @@
     OS_*
     TERM
     ATMOSPHERE_*
+commands_pre =
+    python3 {toxinidir}/tools/generate-galaxy-yml.py
+    ansible-galaxy collection install -f {toxinidir}
 
 [testenv:build]
 deps =
@@ -29,7 +32,6 @@
     pbr
     pyyaml
 commands =
-    python3 {toxinidir}/tools/generate-galaxy-yml.py
     ansible-galaxy collection build --force
 
 [testenv:molecule]