Foreman » Smart Proxy

Due to #2870 the dhcp_native_ms provider always tries to set the
PXEClient opt to empty. However this does not exist in all DHCP servers
(tested on 2008R2) and in this case we currently fail with:

INFO -- : Added DHCP reservation for foo.example.com(10.0.2.20 / 52:54:00:84:64:03)
    DEBUG -- : key: "PXEClient" 
    DEBUG -- : executing: c:\windows\system32\cmd.exe /c c:\Windows\System32\netsh.exe c dhcp server 127.0.0.1 scope 10.0.0.0 set reservedoptionvalue 10.0.2.20 60 String "" 
    INFO - : Vendor class not found
    ERROR -- : Netsh failed:

Changed the current scope context to 10.0.0.0 scope.

The specified option does not exist.

ERROR -- : Unknown error while processing ''
    DEBUG -- : Unknown error while processing '' (Proxy::DHCP::Error)
    C:/Users/Administrator/Downloads/smart-proxy/modules/dhcp_native_ms/dhcp_native_ms_main.rb:246:in `rescue in report'
    C:/Users/Administrator/Downloads/smart-proxy/modules/dhcp_native_ms/dhcp_native_ms_main.rb:223:in `report'
    C:/Users/Administrator/Downloads/smart-proxy/modules/dhcp_native_ms/dhcp_native_ms_main.rb:218:in `execute'
    C:/Users/Administrator/Downloads/smart-proxy/modules/dhcp_native_ms/dhcp_native_ms_main.rb:59:in `block in add_record'
    C:/Users/Administrator/Downloads/smart-proxy/modules/dhcp_native_ms/dhcp_native_ms_main.rb:46:in `each'
    C:/Users/Administrator/Downloads/smart-proxy/modules/dhcp_native_ms/dhcp_native_ms_main.rb:46:in `add_record'
    C:/Users/Administrator/Downloads/smart-proxy/modules/dhcp/dhcp_api.rb:97:in `block in <class:DhcpApi>'
    C:/Users/Administrator/Downloads/smart-proxy/vendor/ruby/2.1.0/gems/sinatra-1.4.7/lib/sinatra/base.rb:1611:in `call'

so ignore errors to set that option.