Flows Improvements

Bugfix: When adding or editing flow, cancel button doesn’t work
Bugfix: When deleting flow with edit form open, the edit form is still
open and goes above the table

Create Flow:
a. Hide the “Node Type” since we’ll always assume OF for now
b. Make Actions dropdown (DROP, LOOPBACK)
Merge remote-tracking branch 'upstream/master'
Merge pull request #14 from violinlakshmi/master

Flows Improvements