Summary:
this diff provides ci builds for our two open source projects, openr and fbzmq, by leveraging snarkmaster 's awesome tool, fbcode builder. this will run our external cmake build process on lego-linux sandcastle boxes and also generates scripts for building on travis with docker externally.
this diff is modeled on D4441467. it also includes some changes to fbcode builder itself and some minor changes in our cmake files.
snarkmaster , please take a look at my fbcode builder changes. I needed to make some modifications in order to build some of our dependencies which have slightly non-standard build steps and to run tests. I split up the configure step, and I addressed an issue around workdir with cmake. the last workdir was just a relative path, `build`, so it was hard to get back to it in a future step to run tests.
Reviewed By: saifhhasan
Differential Revision: D5141184
fbshipit-source-id: 94cacab807a3a0da4d0d81016d7f36f37656145d
