Ignore Windows NICs with nil :net_connection_id
Ignore Windows NICs with nil :net_connection_id

When upping a Win XP box, vagrant found a lot of "virtual" network
connections that did not have DHCP enabled, and tried to configure them
for DHCP. This did not work because their :net_connection_id is nil.
Ignoring these network connections enabled the XP box to be upped.

mwarren/vagrant,sax/vagrant,janek-warchol/vagrant,taliesins/vagrant,jfchevrette/vagrant,Chhunlong/vagrant,bheuvel/vagrant,lukebakken/vagrant,shtouff/vagrant,gpkfr/vagrant,bryson/vagrant,tbriggs-curse/vagrant,jtopper/vagrant,mitchellh/vagrant,ianmiell/vagrant,loren-osborn/vagrant,taliesins/vagrant,h4ck3rm1k3/vagrant,senglin/vagrant,jhoblitt/vagrant,benizi/vagrant,nickryand/vagrant,shtouff/vagrant,dhoer/vagrant,lonniev/vagrant,tjanez/vagrant,jean/vagrant,senglin/vagrant,kamigerami/vagrant,gpkfr/vagrant,darkn3rd/vagrant,carlosefr/vagrant,tomfanning/vagrant,chrisvire/vagrant,lukebakken/vagrant,apertoso/vagrant,jkburges/vagrant,fnewberg/vagrant,philoserf/vagrant,philoserf/vagrant,fnewberg/vagrant,carlosefr/vagrant,mpoeter/vagrant,PatrickLang/vagrant,tbarrongh/vagrant,krig/vagrant,wangfakang/vagrant,darkn3rd/vagrant,jhoblitt/vagrant,Endika/vagrant,jean/vagrant,aneeshusa/vagrant,zsjohny/vagrant,bheuvel/vagrant,senglin/vagrant,Avira/vagrant,crashlytics/vagrant,sni/vagrant,jmanero/vagrant,jfchevrette/vagrant,myrjola/vagrant,teotihuacanada/vagrant,krig/vagrant,Chhunlong/vagrant,dustymabe/vagrant,crashlytics/vagrant,genome21/vagrant,justincampbell/vagrant,jhoblitt/vagrant,Sgoettschkes/vagrant,chrisroberts/vagrant,modulexcite/vagrant,jkburges/vagrant,Sgoettschkes/vagrant,genome21/vagrant,blueyed/vagrant,teotihuacanada/vagrant,jhoblitt/vagrant,tbriggs-curse/vagrant,stephancom/vagrant,modulexcite/vagrant,PatOShea/vagrant,genome21/vagrant,cgvarela/vagrant,krig/vagrant,bdwyertech/vagrant,signed8bit/vagrant,petems/vagrant,kamazee/vagrant,modulexcite/vagrant,Sgoettschkes/vagrant,apertoso/vagrant,lonniev/vagrant,nickryand/vagrant,mitchellh/vagrant,apertoso/vagrant,tjanez/vagrant,bryson/vagrant,marxarelli/vagrant,Chhed13/vagrant,senglin/vagrant,crashlytics/vagrant,janek-warchol/vagrant,bryson/vagrant,denisbr/vagrant,wangfakang/vagrant,Chhunlong/vagrant,tbarrongh/vagrant,ianmiell/vagrant,johntron/vagrant,dhoer/vagrant,denisbr/vagrant,muhanadra/vagrant,stephancom/vagrant,blueyed/vagrant,stephancom/vagrant,sni/vagrant,invernizzi-at-google/vagrant,dharmab/vagrant,PatOShea/vagrant,mkuzmin/vagrant,dharmab/vagrant,tbriggs-curse/vagrant,ferventcoder/vagrant,PatrickLang/vagrant,Endika/vagrant,apertoso/vagrant,cgvarela/vagrant,kalabiyau/vagrant,johntron/vagrant,jberends/vagrant,philoserf/vagrant,h4ck3rm1k3/vagrant,chrisroberts/vagrant,genome21/vagrant,darkn3rd/vagrant,kamigerami/vagrant,aaam/vagrant,lonniev/vagrant,taliesins/vagrant,dustymabe/vagrant,blueyed/vagrant,loren-osborn/vagrant,shtouff/vagrant,wkolean/vagrant,zsjohny/vagrant,lukebakken/vagrant,mwrock/vagrant,tbarrongh/vagrant,stephancom/vagrant,mpoeter/vagrant,jberends/vagrant,jean/vagrant,lukebakken/vagrant,fnewberg/vagrant,patrys/vagrant,nickryand/vagrant,chrisvire/vagrant,sax/vagrant,aneeshusa/vagrant,mwarren/vagrant,myrjola/vagrant,denisbr/vagrant,jkburges/vagrant,Endika/vagrant,jtopper/vagrant,benizi/vagrant,philoserf/vagrant,kalabiyau/vagrant,benizi/vagrant,shtouff/vagrant,kalabiyau/vagrant,benh57/vagrant,wkolean/vagrant,mpoeter/vagrant,doy/vagrant,jmanero/vagrant,doy/vagrant,philwrenn/vagrant,mitchellh/vagrant,sax/vagrant,ferventcoder/vagrant,Chhunlong/vagrant,bdwyertech/vagrant,petems/vagrant,kamazee/vagrant,jtopper/vagrant,sax/vagrant,doy/vagrant,pwnall/vagrant,wkolean/vagrant,justincampbell/vagrant,teotihuacanada/vagrant,vamegh/vagrant,sni/vagrant,jean/vagrant,ferventcoder/vagrant,gitebra/vagrant,bheuvel/vagrant,loren-osborn/vagrant,doy/vagrant,Sgoettschkes/vagrant,zsjohny/vagrant,aneeshusa/vagrant,justincampbell/vagrant,modulexcite/vagrant,benh57/vagrant,vamegh/vagrant,PatOShea/vagrant,carlosefr/vagrant,muhanadra/vagrant,vamegh/vagrant,nickryand/vagrant,Endika/vagrant,taliesins/vagrant,krig/vagrant,Chhed13/vagrant,petems/vagrant,aneeshusa/vagrant,tjanez/vagrant,lonniev/vagrant,kamazee/vagrant,pwnall/vagrant,bheuvel/vagrant,aaam/vagrant,kamazee/vagrant,chrisvire/vagrant,tjanez/vagrant,patrys/vagrant,PatOShea/vagrant,TheBigBear/vagrant,dharmab/vagrant,jtopper/vagrant,dustymabe/vagrant,gpkfr/vagrant,carlosefr/vagrant,gbarberi/vagrant,ferventcoder/vagrant,Avira/vagrant,kamigerami/vagrant,janek-warchol/vagrant,tbarrongh/vagrant,sni/vagrant,mkuzmin/vagrant,ArloL/vagrant,kamigerami/vagrant,ianmiell/vagrant,bdwyertech/vagrant,mitchellh/vagrant,teotihuacanada/vagrant,bshurts/vagrant,bshurts/vagrant,cgvarela/vagrant,Avira/vagrant,tomfanning/vagrant,vamegh/vagrant,pwnall/vagrant,bdwyertech/vagrant,ianmiell/vagrant,aaam/vagrant,bshurts/vagrant,jfchevrette/vagrant,dhoer/vagrant,tomfanning/vagrant,gitebra/vagrant,mkuzmin/vagrant,patrys/vagrant,jmanero/vagrant,tomfanning/vagrant,Chhed13/vagrant,Avira/vagrant,myrjola/vagrant,jmanero/vagrant,muhanadra/vagrant,chrisvire/vagrant,jfchevrette/vagrant,mwarren/vagrant,gbarberi/vagrant,philwrenn/vagrant,marxarelli/vagrant,invernizzi-at-google/vagrant,jberends/vagrant,mkuzmin/vagrant,justincampbell/vagrant,myrjola/vagrant,wangfakang/vagrant,kalabiyau/vagrant,tschortsch/vagrant,benh57/vagrant,ArloL/vagrant,gbarberi/vagrant,mwrock/vagrant,zsjohny/vagrant,signed8bit/vagrant,bryson/vagrant,janek-warchol/vagrant,Chhed13/vagrant,dharmab/vagrant,blueyed/vagrant,fnewberg/vagrant,tschortsch/vagrant,benh57/vagrant,mpoeter/vagrant,gbarberi/vagrant,invernizzi-at-google/vagrant,gitebra/vagrant,signed8bit/vagrant,denisbr/vagrant,cgvarela/vagrant,mwrock/vagrant,gitebra/vagrant,TheBigBear/vagrant,jkburges/vagrant,dhoer/vagrant,PatrickLang/vagrant,h4ck3rm1k3/vagrant,tschortsch/vagrant,petems/vagrant,gpkfr/vagrant,chrisroberts/vagrant,marxarelli/vagrant,jberends/vagrant,philwrenn/vagrant,johntron/vagrant,aaam/vagrant,signed8bit/vagrant,patrys/vagrant,h4ck3rm1k3/vagrant,muhanadra/vagrant,PatrickLang/vagrant,loren-osborn/vagrant,chrisroberts/vagrant,mwrock/vagrant,wangfakang/vagrant,wkolean/vagrant,TheBigBear/vagrant,philwrenn/vagrant,darkn3rd/vagrant,benizi/vagrant,tschortsch/vagrant,bshurts/vagrant,mwarren/vagrant,ArloL/vagrant,johntron/vagrant,tbriggs-curse/vagrant,pwnall/vagrant,invernizzi-at-google/vagrant,marxarelli/vagrant,crashlytics/vagrant,TheBigBear/vagrant,dustymabe/vagrant,ArloL/vagrant