PROTON-1762: [ruby] remove gem self-test
PROTON-1762: [ruby] remove gem self-test

Test was causing mysterious problems on some platforms.
Isolating the installed gem and use the uninstalled qpid-proton library from the build
reqiures some hacking that appears not to be portable.

Opened https://issues.apache.org/jira/browse/PROTON-1765 to restore these tests
in the future if the problems can be solved.

ChugR/qpid-proton,alanconway/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,ssorj/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,astitcher/qpid-proton,kgiusti/qpid-proton,alanconway/qpid-proton,astitcher/qpid-proton,kgiusti/qpid-proton,alanconway/qpid-proton,kgiusti/qpid-proton,apache/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,apache/qpid-proton,ChugR/qpid-proton,kgiusti/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,ChugR/qpid-proton,alanconway/qpid-proton,kgiusti/qpid-proton,ssorj/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,alanconway/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,astitcher/qpid-proton,alanconway/qpid-proton