Missing validations on Create Pool for Subnet and IP

[arturonuman]

Steps to reproduce it:

• Login and go to /admin/create/pool
• Enter a Pool Name
• In Subnet, enter strings like:
  • 999.999.999.999
  • 0
  • ...555
• In IP, enter strings like:
  • 0.1.1.1.1.1
  • -5
  • e
  • '
  • @
  • -5-5-5
• Click on Add IP

See screenshots: