test: enabled the slf4j logging for subethamail smtp server to see what is failing here
test: enabled the slf4j logging for subethamail smtp server to see what is failing here

Original commit: elastic/x-pack-elasticsearch@6c4b1096f9655f6d59f2d64acdbbeb572d7741fb

gfyoung/elasticsearch,HonzaKral/elasticsearch,gfyoung/elasticsearch,gingerwizard/elasticsearch,gingerwizard/elasticsearch,coding0011/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch,gingerwizard/elasticsearch,robin13/elasticsearch,coding0011/elasticsearch,scorpionvicky/elasticsearch,GlenRSmith/elasticsearch,gfyoung/elasticsearch,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,gingerwizard/elasticsearch,gingerwizard/elasticsearch,vroyer/elassandra,uschindler/elasticsearch,scorpionvicky/elasticsearch,GlenRSmith/elasticsearch,scorpionvicky/elasticsearch,coding0011/elasticsearch,gfyoung/elasticsearch,nknize/elasticsearch,HonzaKral/elasticsearch,gingerwizard/elasticsearch,robin13/elasticsearch,nknize/elasticsearch,strapdata/elassandra,nknize/elasticsearch,uschindler/elasticsearch,vroyer/elassandra,nknize/elasticsearch,nknize/elasticsearch,uschindler/elasticsearch,uschindler/elasticsearch,scorpionvicky/elasticsearch,strapdata/elassandra,coding0011/elasticsearch,robin13/elasticsearch,HonzaKral/elasticsearch,strapdata/elassandra,HonzaKral/elasticsearch,coding0011/elasticsearch,GlenRSmith/elasticsearch,gingerwizard/elasticsearch,scorpionvicky/elasticsearch,GlenRSmith/elasticsearch,gfyoung/elasticsearch,robin13/elasticsearch,uschindler/elasticsearch