Add --out flag to redirect output to file

Change-Id: I61012c538b569766a4306a76b0a6fbb526cc4c29
Reviewed-on: http://gerrit.causes.com/44157
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>
Update changelog with --out flag

Change-Id: I397cbdfd58ecf320c2a14567eab0dfc192ec6dcf
Reviewed-on: http://gerrit.causes.com/44158
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane.dasilva@brigade.com>