Revert "upgrade log4j2 to 2.9.1"
Revert "upgrade log4j2 to 2.9.1"

This reverts commit 8c2c2a9946793bc5c957310fb19b1f809e80f070.

zregvart/camel,christophd/camel,tdiesler/camel,Fabryprog/camel,onders86/camel,onders86/camel,gnodet/camel,apache/camel,tadayosi/camel,isavin/camel,DariusX/camel,akhettar/camel,cunningt/camel,tadayosi/camel,pax95/camel,drsquidop/camel,anoordover/camel,gautric/camel,adessaigne/camel,sverkera/camel,kevinearls/camel,gnodet/camel,dmvolod/camel,punkhorn/camel-upstream,gnodet/camel,nikhilvibhav/camel,onders86/camel,Thopap/camel,pmoerenhout/camel,CodeSmell/camel,onders86/camel,objectiser/camel,gautric/camel,akhettar/camel,anoordover/camel,alvinkwekel/camel,snurmine/camel,anton-k11/camel,nikhilvibhav/camel,jamesnetherton/camel,Thopap/camel,davidkarlsen/camel,adessaigne/camel,dmvolod/camel,apache/camel,sverkera/camel,jamesnetherton/camel,pax95/camel,gnodet/camel,akhettar/camel,pmoerenhout/camel,tdiesler/camel,jonmcewen/camel,davidkarlsen/camel,jamesnetherton/camel,tdiesler/camel,punkhorn/camel-upstream,curso007/camel,tdiesler/camel,nicolaferraro/camel,dmvolod/camel,drsquidop/camel,anoordover/camel,mcollovati/camel,cunningt/camel,akhettar/camel,ullgren/camel,anton-k11/camel,jonmcewen/camel,anton-k11/camel,tdiesler/camel,gnodet/camel,ullgren/camel,rmarting/camel,objectiser/camel,adessaigne/camel,gautric/camel,davidkarlsen/camel,ullgren/camel,christophd/camel,jamesnetherton/camel,pax95/camel,snurmine/camel,curso007/camel,drsquidop/camel,alvinkwekel/camel,kevinearls/camel,pmoerenhout/camel,Thopap/camel,DariusX/camel,curso007/camel,tadayosi/camel,jonmcewen/camel,nicolaferraro/camel,cunningt/camel,dmvolod/camel,rmarting/camel,punkhorn/camel-upstream,kevinearls/camel,onders86/camel,alvinkwekel/camel,anton-k11/camel,ullgren/camel,zregvart/camel,snurmine/camel,sverkera/camel,adessaigne/camel,sverkera/camel,nikhilvibhav/camel,jonmcewen/camel,CodeSmell/camel,CodeSmell/camel,anton-k11/camel,tadayosi/camel,objectiser/camel,tadayosi/camel,akhettar/camel,adessaigne/camel,mcollovati/camel,anoordover/camel,jamesnetherton/camel,isavin/camel,pax95/camel,christophd/camel,objectiser/camel,anton-k11/camel,isavin/camel,pax95/camel,kevinearls/camel,drsquidop/camel,rmarting/camel,cunningt/camel,snurmine/camel,isavin/camel,pax95/camel,pmoerenhout/camel,davidkarlsen/camel,DariusX/camel,apache/camel,snurmine/camel,anoordover/camel,jonmcewen/camel,rmarting/camel,mcollovati/camel,pmoerenhout/camel,akhettar/camel,jonmcewen/camel,drsquidop/camel,nikhilvibhav/camel,Thopap/camel,Fabryprog/camel,adessaigne/camel,christophd/camel,tadayosi/camel,cunningt/camel,onders86/camel,apache/camel,jamesnetherton/camel,rmarting/camel,christophd/camel,snurmine/camel,CodeSmell/camel,sverkera/camel,zregvart/camel,isavin/camel,kevinearls/camel,isavin/camel,dmvolod/camel,nicolaferraro/camel,Fabryprog/camel,curso007/camel,tdiesler/camel,alvinkwekel/camel,kevinearls/camel,nicolaferraro/camel,rmarting/camel,gautric/camel,DariusX/camel,mcollovati/camel,zregvart/camel,apache/camel,gautric/camel,dmvolod/camel,Thopap/camel,curso007/camel,cunningt/camel,Thopap/camel,pmoerenhout/camel,sverkera/camel,curso007/camel,apache/camel,anoordover/camel,gautric/camel,drsquidop/camel,punkhorn/camel-upstream,Fabryprog/camel,christophd/camel