Description of problem:
VM reconfigure submit is disabled, when memory new value is inserted,
after filling new value to cpu sockets, and add disk.

Version-Release number of selected component (if applicable):
cfme-5.7.0.11
RHV-4.0.5

Steps to Reproduce:
1. VM reconfigure a down VM
2. Set memory to be changed, but not yet change it (a message will be seen
See screenshot "submit disabled before memory set" attachment.
4. Set the cpu to be changed. change socket number 1->2.
5. Press "Add disk" button, add disk with some size, and press "add" action.
6. Set a new valid value to the memory for example 1024->2048 MB)
submit button still do not turn into enabled, though validation to all fields is OK.
See screenshot "submit disabled after memory set" attachment.

Expected results:
Submit button should be enabled, after setting a new value to the memory,
with the steps above.

Additional information:
If the memory new value is inserted before add disk,
then the submit button is enabled.