peadm::convert misconfigures pe_repo class

[vchepkov]

Describe the Bug

peadm::convert misconfigures pe_repo class by setting data 'pe_repo::compile_master_pool_address' to primary host

$compiler_pool_address is set to $primary_host by default and there is no way to pass undef to peadm::setup::node_manager

Expected Behavior

Need to be able to preserve existing configuration, which is hiera based

Steps to Reproduce

Run peadm::convert, observer data block for pe_repo added to 'PE Master group'