1）svn服务已开启
2）使用的是apache2.4，服务已开启
3）配置文件：
anon-access = read
auth-access = write
The password-db option controls the location of the password
database file. Unless you specify a path starting with a /,
the file's location is relative to the directory containing
this configuration file.
If SASL is enabled (see below), this file will NOT be used.
Uncomment the line below to use the default password file.
password-db = passwd
check out时：
Unable to connect to a repository at URL 'svn://172.16.101.108/SVNserver'
Network connection closed unexpectedly
