fix(user manage and connect first login)

When delete a user, but didn't delete the user sysuser key. When create
a user with same username, error occur.

When user login tty, and type a num first, it will search a host, but
login the asset with the id.

fixed

juser/user_api.py

@@ -181,6 +181,8 @@ def server_del_user(username):
     删除系统上的某用户
     """
     bash('userdel -r -f %s' % username)
+    print('rm -f %s/%s_*.pem' % (os.path.join(KEY_DIR, 'user'), username))
+    bash('rm -f %s/%s_*.pem' % (os.path.join(KEY_DIR, 'user'), username))
 
 
 def get_display_msg(user, password='', ssh_key_pwd='', send_mail_need=False):