Fix test race condition
Fix test race condition

E-tag propagation replies on the mtime of the file. Order of events:

1. add file 'foo.txt' with content 'bar'
2. Set mtime to now() - 1
3. Check if etag changed.

Now this goes right often when 1 and 2 happen in the same second.
However imagine

1. add file 'foo.txt' with content 'bar' (at t=0.999)
2. Set mtime to now() - 1 (at t=1.001)

Now the mtime will be set to the same time. Thus not chaning the etag.

jbicha/server,pollopolea/core,andreas-p/nextcloud-server,whitekiba/server,IljaN/core,xx621998xx/server,bluelml/core,andreas-p/nextcloud-server,cernbox/core,pmattern/server,jbicha/server,jbicha/server,pmattern/server,owncloud/core,endsguy/server,pixelipo/server,pmattern/server,andreas-p/nextcloud-server,cernbox/core,Ardinis/server,endsguy/server,Ardinis/server,sharidas/core,sharidas/core,pixelipo/server,nextcloud/server,endsguy/server,pollopolea/core,jbicha/server,phil-davis/core,sharidas/core,bluelml/core,nextcloud/server,michaelletzgus/nextcloud-server,cernbox/core,Ardinis/server,cernbox/core,owncloud/core,xx621998xx/server,owncloud/core,pollopolea/core,whitekiba/server,michaelletzgus/nextcloud-server,sharidas/core,whitekiba/server,IljaN/core,nextcloud/server,xx621998xx/server,jbicha/server,pixelipo/server,xx621998xx/server,pixelipo/server,IljaN/core,Ardinis/server,michaelletzgus/nextcloud-server,bluelml/core,bluelml/core,xx621998xx/server,IljaN/core,whitekiba/server,pollopolea/core,bluelml/core,pmattern/server,whitekiba/server,owncloud/core,endsguy/server,andreas-p/nextcloud-server,pixelipo/server,IljaN/core,nextcloud/server,owncloud/core,cernbox/core,Ardinis/server,andreas-p/nextcloud-server,pollopolea/core,endsguy/server,sharidas/core,michaelletzgus/nextcloud-server,pmattern/server