Support N distributed agents

This is the third main feature of this system. The code needs a bunch of
polish, but it actually all works :)

I've tested this briefly with N <= 3.

Currently you have to build your own etcd cluster. It's quite easy, just
run `etcd` and it will be ready. I usually run it in a throw away /tmp/
dir so that I can blow away the stored data easily.

examples/graph1.yaml

@@ -5,22 +5,22 @@ types:
   - name: noop1
   file:
   - name: file1
-    path: /tmp/mgmt/f1
+    path: "/tmp/mgmt/f1"
     content: |
       i am f1
     state: exists
   - name: file2
-    path: /tmp/mgmt/f2
+    path: "/tmp/mgmt/f2"
     content: |
       i am f2
     state: exists
   - name: file3
-    path: /tmp/mgmt/f3
+    path: "/tmp/mgmt/f3"
     content: |
       i am f3
     state: exists
   - name: file4
-    path: /tmp/mgmt/f4
+    path: "/tmp/mgmt/f4"
     content: |
       i am f4 and i should not be here
     state: absent

examples/graph2.yaml

@@ -5,7 +5,7 @@ types:
   - name: noop1
   file:
   - name: file1
-    path: /tmp/mgmt/f1
+    path: "/tmp/mgmt/f1"
     content: |
       i am f1
     state: exists

examples/graph3a.yaml

@@ -2,43 +2,43 @@
 graph: mygraph
 types:
   noop:
-  - name: noop1
+  - name: noop1a
   file:
-  - name: file1
-    path: /tmp/mgmt/f1
+  - name: file1a
+    path: "/tmp/mgmt1/f1a"
     content: |
       i am f1
     state: exists
-  - name: file2
-    path: /tmp/mgmt/f2
+  - name: file2a
+    path: "/tmp/mgmt1/f2a"
     content: |
       i am f2
     state: exists
-  - name: '@@file3'
-    path: /tmp/mgmt/f3
+  - name: "@@file3a"
+    path: "/tmp/mgmt1/f3a"
     content: |
       i am f3, exported from host A
     state: exists
-  - name: '@@file4'
-    path: /tmp/mgmt/f4
+  - name: "@@file4a"
+    path: "/tmp/mgmt1/f4a"
     content: |
       i am f4, exported from host A
     state: exists
 collect:
 - type: file
-  pattern: ''
+  pattern: "/tmp/mgmt1/"
 edges:
 - name: e1
   from:
     type: noop
-    name: noop1
+    name: noop1a
   to:
     type: file
-    name: file1
+    name: file1a
 - name: e2
   from:
     type: file
-    name: file1
+    name: file1a
   to:
     type: file
-    name: file2
+    name: file2a

examples/graph3b.yaml

@@ -2,43 +2,43 @@
 graph: mygraph
 types:
   noop:
-  - name: noop1
+  - name: noop1b
   file:
-  - name: file1
-    path: /tmp/mgmt/f1
+  - name: file1b
+    path: "/tmp/mgmt2/f1b"
     content: |
       i am f1
     state: exists
-  - name: file2
-    path: /tmp/mgmt/f2
+  - name: file2b
+    path: "/tmp/mgmt2/f2b"
     content: |
       i am f2
     state: exists
-  - name: '@@file3'
-    path: /tmp/mgmt/f3
+  - name: "@@file3b"
+    path: "/tmp/mgmt2/f3b"
     content: |
       i am f3, exported from host B
     state: exists
-  - name: '@@file4'
-    path: /tmp/mgmt/f4
+  - name: "@@file4b"
+    path: "/tmp/mgmt2/f4b"
     content: |
       i am f4, exported from host B
     state: exists
 collect:
 - type: file
-  pattern: ''
+  pattern: "/tmp/mgmt2/"
 edges:
 - name: e1
   from:
     type: noop
-    name: noop1
+    name: noop1b
   to:
     type: file
-    name: file1
+    name: file1b
 - name: e2
   from:
     type: file
-    name: file1
+    name: file1b
   to:
     type: file
-    name: file2
+    name: file2b

examples/graph3c.yaml

@@ -0,0 +1,44 @@
+---
+graph: mygraph
+types:
+  noop:
+  - name: noop1c
+  file:
+  - name: file1c
+    path: "/tmp/mgmt3/f1c"
+    content: |
+      i am f1
+    state: exists
+  - name: file2c
+    path: "/tmp/mgmt3/f2c"
+    content: |
+      i am f2
+    state: exists
+  - name: "@@file3c"
+    path: "/tmp/mgmt3/f3c"
+    content: |
+      i am f3, exported from host C
+    state: exists
+  - name: "@@file4c"
+    path: "/tmp/mgmt3/f4c"
+    content: |
+      i am f4, exported from host C
+    state: exists
+collect:
+- type: file
+  pattern: "/tmp/mgmt3/"
+edges:
+- name: e1
+  from:
+    type: noop
+    name: noop1c
+  to:
+    type: file
+    name: file1c
+- name: e2
+  from:
+    type: file
+    name: file1c
+  to:
+    type: file
+    name: file2c

examples/graph4.yaml

@@ -3,12 +3,12 @@ graph: mygraph
 types:
   file:
   - name: file1
-    path: /tmp/mgmt/f1
+    path: "/tmp/mgmt/f1"
     content: |
       i am f1
     state: exists
-  - name: '@@file3'
-    path: /tmp/mgmt/f3
+  - name: "@@file3"
+    path: "/tmp/mgmt/f3"
     content: |
       i am f3, exported from host A
     state: exists

examples/graph5.yaml

@@ -3,7 +3,7 @@ graph: mygraph
 types:
   file:
   - name: file1
-    path: /tmp/mgmt/f1
+    path: "/tmp/mgmt/f1"
     content: |
       i am f1
     state: exists