initialize-build-host.sh: Remove Mender devs SSH keys
initialize-build-host.sh: Remove Mender devs SSH keys

This is only used on CFEngine build machines, so very rarely a Mender
developer will need to log in there. Remove them to ease future
maintenance.

Signed-off-by: Lluis Campos <9244cb41c39addfc5cf236920b776ea2820513d0@northern.tech>

mendersoftware/meta-mender-qemu