The installation in the buildtree environment is not useful as all is pre-installed in the image.

added a /CANSTART file so that eos waits for all keys to be OK before starting.
/bin/sh -> /bin/bash to allow function names with `-`...
yum and yum-config-manager overridden when in BUILDTREE environment
ctafrontend not booting needs further work

fixing rmcd log issue as /var/log/castor/rmcd_legacy.log was a named pipe and nothing was collected in artifacts.

Cleaning up run scripts for containers: going along Dockerfile and in /opt/run/bin: /shared still available for local scripts developments.