Omit periods from warning messages for consistency

We were mostly doing this anyway, but for uniform output we don't want
unnecessary punctuation in the warning messages.

Change-Id: If9a6a7cff8e4795bbeed33faeab208b86351342c
Reviewed-on: https://gerrit.causes.com/23512
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Lann Martin <lann@causes.com>
Reviewed-by: Greg Hurrell <greg@causes.com>