builds: fix BUILD_LOGLEVEL tests for nightlies
builds: fix BUILD_LOGLEVEL tests for nightlies

These tests assume that builder's OS_GIT_MAJOR starts with 'v' as it
does in CI.  However, productized builds (nightlies and stable) are
built with OS_GIT_MAJOR=4.  When these tests from the openshift/build
testsuite are run on a nightly, the first fails, and the second could
return a false negative.

csrwng/origin,JacobTanenbaum/origin,gabemontero/origin,gabemontero/origin,akram/origin,sallyom/origin,bparees/origin,hroyrh/origin,mfojtik/origin,deads2k/origin,soltysh/origin,mahak/origin,JacobTanenbaum/origin,mahak/origin,JacobTanenbaum/origin,akram/origin,mfojtik/origin,csrwng/origin,deads2k/origin,jsafrane/origin,jsafrane/origin,soltysh/origin,bparees/origin,sallyom/origin,mahak/origin,hroyrh/origin,openshift/origin,deads2k/origin,openshift/origin,jsafrane/origin,akram/origin,csrwng/origin,openshift/origin,soltysh/origin,gabemontero/origin,sallyom/origin,mfojtik/origin,bparees/origin,hroyrh/origin