Update bindep role defaults to be more sane

The default for bindep dir should really be zuul.project.src_dir.

Also, this is a CI system. Let's default profile to test.

Change-Id: Ibc0e7617195865c50ea2bb0e969963f0525ea9b1

roles/bindep/README.rst

@@ -8,11 +8,12 @@ then install the missing packages.
 **Role Variables**
 
 .. zuul:rolevar:: bindep_dir
-   :default: .
+   :default: {{ zuul.project.src_dir }}
 
    The directory to look for bindep files in.
 
 .. zuul:rolevar:: bindep_profile
+   :default: test
 
    A specific bindep profile to request.
 

roles/bindep/defaults/main.yaml

@@ -1,3 +1,3 @@
 ---
-bindep_dir: .
-bindep_profile: ""
+bindep_dir: "{{ zuul.project.src_dir }}"
+bindep_profile: test