make directory name correspond with dockerfile

2 jobs for xrdcl-http in 6 minutes and 30 seconds
Status Job ID Name Coverage
  Build
passed #227691
build_voms_proxy_init

00:06:30

failed #227690
build_xcache

00:01:35

 
Name Stage Failure
failed
build_xcache Build
Error downloading packages:
1:xrootd-server-libs-4.12.4-1.el7.x86_64: [Errno 256] No more mirrors to try.
1:xrootd-libs-4.12.4-1.el7.x86_64: [Errno 256] No more mirrors to try.
1:xrootd-client-libs-4.12.4-1.el7.x86_64: [Errno 256] No more mirrors to try.
1:xrootd-server-4.12.4-1.el7.x86_64: [Errno 256] No more mirrors to try.

error building image: error building stage: failed to execute command: waiting for process to exit: exit status 1
Cleaning up file based variables
ERROR: Job failed: exit code 1