[ACS44] cherry pick CLOUDSTACK-6606

[Jessica Wang]

Hi Hugo/Daan,

Could you please cherry-pick following commit to 4.4 branch?

Commit hash:    0d7ddc4337568939f47de875f1a03f39b54e3b30

CLOUDSTACK-6606: create network offering dailog box has greyed out (not 
selectable) providers for the connectivity service.

Thanks,

Jessica