This is the second step in removing the embedded etcd server from the MicroShift binary.

AC:

• The embedded etcd server in MicroShift is removed, all go.mod dependencies on etcd should be removed.
• The etcd server should be launched with correct command line arguments; a user of MicroShift prior to this change should not notice any difference in etcd.
• The etcd transient systemd unit execution should be updated to use the etcd binary provided by an rpm.