Spock UI: The settings pages could be improved

All the tabs in the Settings page look contain a lot of whitespace and don't use the while page well. Following changes might make it look better and with the same feel as other pages.

• Align all text boxes in Cluster settings page (and other pages too). While each sub-component of the page (like RAM quota) are aligned, aligning all the text boxes will have a better feel to the page.
• Better placing of the text and controls: Having the controls in the center of the page might give better look.
• Make the look and feel of the pages consistent with other pages in UI