Add a REPEAT option to the test:cxx target for keep running unit tests until it fails.
Add a REPEAT option to the test:cxx target for keep running unit tests until it fails.

jawj/passenger,kewaunited/passenger,jawj/passenger,cgvarela/passenger,clemensg/passenger,phusion/passenger,clemensg/passenger,bf4/passenger,kewaunited/passenger,phusion/passenger,clemensg/passenger,phusion/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,phusion/passenger,cgvarela/passenger,phusion/passenger,clemensg/passenger,antek-drzewiecki/passenger,jawj/passenger,bf4/passenger,phusion/passenger,cgvarela/passenger,kewaunited/passenger,cgvarela/passenger,clemensg/passenger,antek-drzewiecki/passenger,cgvarela/passenger,bf4/passenger,cgvarela/passenger,kewaunited/passenger,jawj/passenger,phusion/passenger,kewaunited/passenger,bf4/passenger,kewaunited/passenger,kewaunited/passenger,kewaunited/passenger,cgvarela/passenger,bf4/passenger,bf4/passenger,clemensg/passenger,antek-drzewiecki/passenger,clemensg/passenger,cgvarela/passenger,jawj/passenger,jawj/passenger,bf4/passenger,antek-drzewiecki/passenger,phusion/passenger,jawj/passenger,clemensg/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger