If the option is set to true, the code will append the file with given content.
Cloud-config example:
write_files:
-
content: "append"
path: 'C:\\path.txt'
append: true
Fixes: https://github.com/cloudbase/cloudbase-init/issues/25
Change-Id: Ifd3d21842042dd34f7fde38a992e7fd74c1a595d