cifsd: update to git (2019-11-27), fix reload/restart not applying smb.conf changes

cifsd: update to git (2019-11-27), fix reload/restart not applying smb.conf changes

* fix reload/restart not applying luci/smb.conf changes
* remove hotfix for 'read only = no' (fixed by upstream)
* update documentation, example
*cifsd: fix the lost of dos file attributes
*cifsd: store FILE_ATTRIBUTE_SPARSE into xattr
*cifsd: release v2.0.2
*cifsd-tools: add smb.conf.list file to show supported parameters list
*cifsd-tools: set CIFSD_SHARE_FLAG_WRITEABLE flags if read only = no
*cifsd-tools: release cifsd-tools v2.0.2

Signed-off-by: Andy Walsh <redacted>