'Configure disks', 'Configure interfaces' buttons are inactive if select all nodes after deployment

[Andrey Sledzinskiy]

Bug is reproduced on {"build_id": "2014-04-10_01-00-26", "mirantis": "yes", "build_number": "92", "nailgun_sha": "d593b43f0219447ca8d1434ee69265ab80a5e24f", "production": "dev", "ostf_sha": "17f2fe6e56452f8e2f01a385be4c4b87bf3698a8", "fuelmain_sha": "e8141c470471d872bb9c979d80340c2d56bc21e6", "astute_sha": "35473eb08b16f4778283e993126a4fd15eb1d00f", "release": "5.0", "fuellib_sha": "0e4c251a1ab4aed317aeb79d6859dfcfe1314463"}

Steps:
1. Create any simple cluster with 2 or more nodes
2. Deploy cluster
3. Open nodes tab
4. Click on select all for all groups of nodes

Expected - 'Configure disks', 'Configure interfaces' buttons are active
Actual - buttons are inactive, only if one node is selected these buttons are active (see attached screen InactiveButtons.png)

[Vitaly Kramskikh (vkramskikh)]

We decided to disable this button for deployed env for 1+ nodes as these buttons are useless for 1+ nodes