Sato Kenta

Add umask option for mount module

7

##### SUMMARY I added `mode` option for mount module. When this module creates new directories for mount point, this value is used as permission of the directory. Fixes #163, #178...

Fixed sysctl to work on symlinks

7

##### SUMMARY Fixes #111. This issue reports a bug of sysctl that the module does not work properly when sysctl_file is a symlink. I Fixed the bug by inserting `os.path.realpath`...