[FAB-10349] TestPluginLoadingFailure fails on macOS
[FAB-10349] TestPluginLoadingFailure fails on macOS

This CR updates the TestPluginLoadingFailure test to not
look for "invalid ELF header", which is OS specific, in
the panic message

Change-Id: I86aafce4becc589ed045cced806bc6423cb2e554
Signed-off-by: Will Lahti <f19a2779710675aad3df5c81e4ecfde11707e3aa@us.ibm.com>

xixuejia/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,xixuejia/fabric,xixuejia/fabric,muralisrini/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,stemlending/fabric,stemlending/fabric,binhn/fabric,manish-sethi/fabric,muralisrini/fabric,binhn/fabric,hyperledger/fabric,jimthematrix/fabric,hyperledger/fabric,binhn/fabric,manish-sethi/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,jimthematrix/fabric