Update initial form for IP trunk creation

The input form for creating a new IP trunk is now a three-step process, where side A and B are steps 2 and 3.

• It is no longer possible to select the same device for both sides.
• The min number of links is enforced as a required amount of inputs.

@simone.spinelli the input step enforces IPTRUNK_MINUMUM_LINKS to be the exact amount of links that should be added. Is this intended behaviour?

gso/workflows/iptrunk/create_iptrunk.py

@@ -52,9 +52,8 @@ def initial_input_form_generator(product_name: str) -> FormGenerator:
 
     initial_user_input = yield CreateIptrunkForm
 
-    class AeMembersList(UniqueConstrainedList[str]):
+    class AeMembersListA(UniqueConstrainedList[str]):
         min_items = initial_user_input.iptrunk_minimum_links
-        max_items = initial_user_input.iptrunk_minimum_links
 
     DeviceEnumA = Choice('Device A', zip(devices.keys(), devices.items()))
 
@@ -65,8 +64,8 @@ def initial_input_form_generator(product_name: str) -> FormGenerator:
         iptrunk_sideA_node_id: DeviceEnumA
         iptrunk_sideA_ae_iface: str
         iptrunk_sideA_ae_geant_a_sid: str
-        iptrunk_sideA_ae_members: AeMembersList
-        iptrunk_sideA_ae_members_descriptions: AeMembersList
+        iptrunk_sideA_ae_members: AeMembersListA
+        iptrunk_sideA_ae_members_descriptions: AeMembersListA
 
     user_input_side_a = yield CreateIptrunkSideAForm
 
@@ -74,6 +73,10 @@ def initial_input_form_generator(product_name: str) -> FormGenerator:
     devices.pop(str(user_input_side_a.iptrunk_sideA_node_id.name))
     DeviceEnumB = Choice('Device B', zip(devices.keys(), devices.items()))
 
+    class AeMembersListB(UniqueConstrainedList[str]):
+        min_items = len(user_input_side_a.iptrunk_sideA_ae_members)
+        max_items = len(user_input_side_a.iptrunk_sideA_ae_members)
+
     class CreateIptrunkSideBForm(FormPage):
         class Config:
             title = 'Provide subscription details for side B of the trunk.'
@@ -81,8 +84,8 @@ def initial_input_form_generator(product_name: str) -> FormGenerator:
         iptrunk_sideB_node_id: DeviceEnumB
         iptrunk_sideB_ae_iface: str
         iptrunk_sideB_ae_geant_a_sid: str
-        iptrunk_sideB_ae_members: AeMembersList
-        iptrunk_sideB_ae_members_descriptions: AeMembersList
+        iptrunk_sideB_ae_members: AeMembersListB
+        iptrunk_sideB_ae_members_descriptions: AeMembersListB
 
     user_input_side_b = yield CreateIptrunkSideBForm