Add MultilinePipe linter

Add a linter `MultilinePipe` which checks for and prevents the use of
the pipe `|` character to wrap multiple lines.

Change-Id: Id06f44d57ded7bcd8e4c3e470a7f84c7744c692f
Reviewed-on: https://gerrit.causes.com/28741
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Greg Hurrell <greg@causes.com>