Automatically append a new empty line to features' local template file while setting up AGL

Current implementation of `meta-agl/scripts/.aglsetup_genconfig.bash` requires features' local file has to end with a new empty line, otherwise, an error occurs:

Example:

--- Starting bitbake server pid 29021 at 2019-06-24 09:52:42.899914 ---

ERROR: ParseError at /home/Workspace/master/build/conf/local.conf:284: 
unparsed line: 'DEPLOY_DIR ?= "${TOPDIR}/deploy"#'

It will be nice to automatically add a new line at the end of the cat'ed feature's local file. This will avoid errors and make the script more flexible.