Created the 5.1 Storage Engine API tree

Changed the tree default configuration

.bzr-mysql/default.conf

 [MYSQL]
 post_commit_to = "commits@lists.mysql.com"
 post_push_to = "commits@lists.mysql.com"
-tree_name = "mysql-5.1"
+tree_name = "mysql-5.1-sea"
+tree_location = bzr+ssh://bk-internal.mysql.com/bzrroot/mysql-5.1-sea
+post_commit_url = bzr+ssh://bk-internal.mysql.com/bzrroot/mysql-5.1-sea
+project_name = "MySQL Storage Engine API team tree"