host/volume: Remove special default provider ref.
host/volume: Remove special default provider ref.

The "default" name will still be specially handled (it's essential to have at least one provider available, and restore functionality will assert this as well), but this special field is not required.

Signed-off-by: Eric Myhre <96f164ad4d9b2b0dacf8ebee2bb1eeb3aa69adf1@flynn.io>

whouses/flynn,tonicbupt/flynn,clifff/flynn,lmars/flynn,rikur/flynn,GrimDerp/flynn,josephglanville/flynn,schatt/flynn,justintung/flynn,josephglanville/flynn,tonicbupt/flynn,schatt/flynn,lmars/flynn,kgrz/flynn,clifff/flynn,arekkas/flynn,whouses/flynn,tonicbupt/flynn,justintung/flynn,josephglanville/flynn,supermario/flynn,kgrz/flynn,whouses/flynn,justintung/flynn,rikur/flynn,ozum/flynn,arekkas/flynn,tonicbupt/flynn,schatt/flynn,benbjohnson/flynn,josephglanville/flynn,jzila/flynn,flynn/flynn,ozum/flynn,flynn/flynn,Brandywine2161/flynn,pkdevbox/flynn,pkdevbox/flynn,kgrz/flynn,clifff/flynn,philiplb/flynn,Brandywine2161/flynn,clifff/flynn,benbjohnson/flynn,rikur/flynn,pkdevbox/flynn,GrimDerp/flynn,arekkas/flynn,GrimDerp/flynn,justintung/flynn,TribeMedia/flynn,jzila/flynn,felixrieseberg/flynn,shads196770/flynn,tonicbupt/flynn,Brandywine2161/flynn,TribeMedia/flynn,ozum/flynn,schatt/flynn,philiplb/flynn,clifff/flynn,philiplb/flynn,josephglanville/flynn,jzila/flynn,felixrieseberg/flynn,benbjohnson/flynn,kgrz/flynn,felixrieseberg/flynn,lmars/flynn,philiplb/flynn,shads196770/flynn,TribeMedia/flynn,benbjohnson/flynn,jzila/flynn,technosophos/flynn,whouses/flynn,flynn/flynn,benbjohnson/flynn,arekkas/flynn,technosophos/flynn,supermario/flynn,flynn/flynn,felixrieseberg/flynn,kgrz/flynn,GrimDerp/flynn,GrimDerp/flynn,pkdevbox/flynn,lmars/flynn,josephglanville/flynn,Brandywine2161/flynn,ozum/flynn,shads196770/flynn,lmars/flynn,arekkas/flynn,ozum/flynn,felixrieseberg/flynn,shads196770/flynn,technosophos/flynn,TribeMedia/flynn,TribeMedia/flynn,supermario/flynn,rikur/flynn,supermario/flynn,supermario/flynn,ozum/flynn,jzila/flynn,justintung/flynn,benbjohnson/flynn,rikur/flynn,Brandywine2161/flynn,whouses/flynn,shads196770/flynn,rikur/flynn,GrimDerp/flynn,kgrz/flynn,technosophos/flynn,clifff/flynn,supermario/flynn,jzila/flynn,technosophos/flynn,schatt/flynn,shads196770/flynn,flynn/flynn,pkdevbox/flynn,TribeMedia/flynn,Brandywine2161/flynn,philiplb/flynn,pkdevbox/flynn,justintung/flynn,whouses/flynn,schatt/flynn