Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - bugfix: hosts info is wrongly processed
    
    changes:
    1. add usage example in hosts.yaml.sample
    2. fix /etc/hosts from wrong format {'hostname': 'ip'} to
       the right 'ip hostnames'
    3. fix --add-hosts from wrong usage --add-host {'hostname': 'ip'} to
       the right --add-host='hostnames':ip
    4. support per ip mapping mutiple hostnames, which is also
       in line with /etc/hosts schema
    
    JIRA: DOVETAIL-556
    
    Change-Id: I92e8cb0fd3476b61f5c73a69e34c4a66aef51d6e
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>
    

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
-Subproject 81ea24a3e8fca5a11191129e92ab1b9bc985759
+Subproject 2b090511832f1898f7d15cc33a6b9b20a8d88e0