bug 932519 - (1/3) move common OCSP response generation test code for refactoring r=cviecco r=briansmith

--HG--
rename : security/manager/ssl/tests/unit/tlsserver/cmd/OCSPStaplingServer.cpp => security/manager/ssl/tests/unit/tlsserver/lib/OCSPCommon.cpp
rename : security/manager/ssl/tests/unit/tlsserver/cmd/OCSPStaplingServer.cpp => security/manager/ssl/tests/unit/tlsserver/lib/OCSPCommon.h
bug 932519 - (2/3) rename OCSP response generation test code to remove "stapling" r=cviecco r=briansmith
bug 932519 - (3/3) add an optional additional cert name as a parameter to GetOCSPResponseForType r=cviecco r=briansmith