graft: add test to check the phase of new changesets

Graft actually do not keep the phase of the source
changesets: no need to change the graft code and add
test to check this behaviour.

tests/test-graft.t

@@ -22,6 +22,24 b' Create a repo with some stuff in it:'
   $ hg merge -q default --tool internal:local
   $ hg branch -q default
   $ hg ci -m6
+  $ hg phase --public 3
+  $ hg phase --force --secret 6
+
+  $ hg --config extensions.graphlog= log -G --template '{author}@{rev}.{phase}: {desc}\n'
+  @    [e-mail]: 6
+  |\
+  | o  [e-mail]: 5
+  | |
+  o |  [e-mail]: 4
+  |/
+  o  [e-mail]: 3
+  |
+  o  [e-mail]: 2
+  |
+  o  [e-mail]: 1
+  |
+  o  [e-mail]: 0
+  
 
 Need to specify a rev:
 
@@ -181,30 +199,30 b' Compare with original:'
 
 View graph:
 
-  $ hg --config extensions.graphlog= log -G --template '{author}@{rev}: {desc}\n'
-  @  test@11: 3
+  $ hg --config extensions.graphlog= log -G --template '{author}@{rev}.{phase}: {desc}\n'
+  @  [e-mail]: 3
   |
-  o  test@10: 4
+  o  [e-mail]: 4
   |
-  o  test@9: 5
+  o  [e-mail]: 5
   |
-  o  bar@8: 1
+  o  [e-mail]: 1
   |
-  o  foo@7: 2
+  o  [e-mail]: 2
   |
-  | o    test@6: 6
+  | o    [e-mail]: 6
   | |\
-  | | o  test@5: 5
+  | | o  [e-mail]: 5
   | | |
-  | o |  test@4: 4
+  | o |  [e-mail]: 4
   | |/
-  | o  baz@3: 3
+  | o  [e-mail]: 3
   | |
-  | o  test@2: 2
+  | o  [e-mail]: 2
   | |
-  | o  bar@1: 1
+  | o  [e-mail]: 1
   |/
-  o  test@0: 0
+  o  [e-mail]: 0
   
 Graft again onto another branch should preserve the original source
   $ hg up -q 0