Fixed git submodule initialization for older git versions (< 1.5.6).

Use `git submodule init && git submodule update` instead of
`git submodule update --init`. The latter was added in git 1.5.6, which is
newer than the default git version in Ubuntu 8.04 LTS (1.5.4.3).

lib/vlad/git.rb

@@ -20,7 +20,8 @@ def checkout(revision, destination)
         "#{git_cmd} checkout -q origin",
         "#{git_cmd} fetch",
         "#{git_cmd} reset --hard #{revision}",
-        "#{git_cmd} submodule update --init",
+        "#{git_cmd} submodule init",
+        "#{git_cmd} submodule update",
         "#{git_cmd} branch -f deployed-#{revision} #{revision}",
         "#{git_cmd} checkout deployed-#{revision}",
         "cd -"
@@ -29,7 +30,8 @@ def checkout(revision, destination)
       [ "rm -rf #{destination}",
         "#{git_cmd} clone #{repository} #{destination}",
         "cd #{destination}",
-        "#{git_cmd} submodule update --init",
+        "#{git_cmd} submodule init",
+        "#{git_cmd} submodule update",
         "#{git_cmd} checkout -f -b deployed-#{revision} #{revision}",
         "cd -"
       ].join(" && ")

test/test_vlad_git.rb

@@ -18,34 +18,34 @@ def setup
   # Checkout the way the default :update task invokes the method
   def test_checkout
     cmd = @scm.checkout 'head', '/the/scm/path'
-    assert_equal 'rm -rf /the/scm/path/repo && git clone git@myhost:/home/john/project1 /the/scm/path/repo && cd /the/scm/path/repo && git submodule update --init && git checkout -f -b deployed-HEAD HEAD && cd -', cmd
+    assert_equal 'rm -rf /the/scm/path/repo && git clone git@myhost:/home/john/project1 /the/scm/path/repo && cd /the/scm/path/repo && git submodule init && git submodule update && git checkout -f -b deployed-HEAD HEAD && cd -', cmd
   end
 
   # (fast-mode) Checkout the way the default :update task invokes the method
   def test_checkout_fast
     cmd = @scm_fast.checkout 'head', '/the/scm/path'
-    assert_equal 'cd /the/scm/path/repo && git checkout -q origin && git fetch && git reset --hard HEAD && git submodule update --init && git branch -f deployed-HEAD HEAD && git checkout deployed-HEAD && cd -', cmd
+    assert_equal 'cd /the/scm/path/repo && git checkout -q origin && git fetch && git reset --hard HEAD && git submodule init && git submodule update && git branch -f deployed-HEAD HEAD && git checkout deployed-HEAD && cd -', cmd
   end
 
   # This is not how the :update task invokes the method
   def test_checkout_revision
     # Checkout to the current directory
     cmd = @scm.checkout 'master', '.'
-    assert_equal 'rm -rf ./repo && git clone git@myhost:/home/john/project1 ./repo && cd ./repo && git submodule update --init && git checkout -f -b deployed-master master && cd -', cmd
+    assert_equal 'rm -rf ./repo && git clone git@myhost:/home/john/project1 ./repo && cd ./repo && git submodule init && git submodule update && git checkout -f -b deployed-master master && cd -', cmd
 
     # Checkout to a relative path
     cmd = @scm.checkout 'master', 'some/relative/path'
-    assert_equal 'rm -rf some/relative/path/repo && git clone git@myhost:/home/john/project1 some/relative/path/repo && cd some/relative/path/repo && git submodule update --init && git checkout -f -b deployed-master master && cd -', cmd
+    assert_equal 'rm -rf some/relative/path/repo && git clone git@myhost:/home/john/project1 some/relative/path/repo && cd some/relative/path/repo && git submodule init && git submodule update && git checkout -f -b deployed-master master && cd -', cmd
   end
 
     # (fast-mode) This is not how the :update task invokes the method
   def test_checkout_revision_fast
     # Checkout to the current directory
     cmd = @scm_fast.checkout 'master', '.'
-    assert_equal 'cd ./repo && git checkout -q origin && git fetch && git reset --hard master && git submodule update --init && git branch -f deployed-master master && git checkout deployed-master && cd -', cmd
+    assert_equal 'cd ./repo && git checkout -q origin && git fetch && git reset --hard master && git submodule init && git submodule update && git branch -f deployed-master master && git checkout deployed-master && cd -', cmd
 
     cmd = @scm_fast.checkout 'master', 'some/relative/path'
-    assert_equal 'cd some/relative/path/repo && git checkout -q origin && git fetch && git reset --hard master && git submodule update --init && git branch -f deployed-master master && git checkout deployed-master && cd -', cmd
+    assert_equal 'cd some/relative/path/repo && git checkout -q origin && git fetch && git reset --hard master && git submodule init && git submodule update && git branch -f deployed-master master && git checkout deployed-master && cd -', cmd
   end
 
   def test_export