BREAKING CHANGE:
支持proc/self目录对外变更:
1.支持/proc/self挂载目录，用于获取进程信息

Close #I6CZ72
Signed-off-by: Nzhushengle <zhushengle@huawei.com>
Change-Id: I465278785bd9e27ddbf4d34ee7b5457e39f98b5b