Renamed DomainRepo#Share to CreateSharedDomain

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
Updated DomainRepo#FindByName methods to lookup shared domains too
[#59074438]

Signed-off-by: Nick Wade <nwade@pivotallabs.com>
Updated DomainRepo#FindAllInOrg to also include shared domains
[#59074438]

Signed-off-by: Nick Wade <nwade@pivotallabs.com>