hub allocate capsul IP addr when the create operation is being claimed

create.sh will now be passed two extra arguments from the web app:

network_name and public_ipv4_address

network_name will be virbr1 or virbr2 or whatever the network is called
and public_ipv4_address will be an ipv4 from that network which is not
currently being used

capsulflask/db_model.py

@@ -56,8 +56,12 @@ class DBModel:
 
   #     ------    VM & ACCOUNT MANAGEMENT     ---------  
 
-  def all_non_deleted_vms_by_host_and_network(self):
-    self.cursor.execute("SELECT id, host, network_name, public_ipv4, public_ipv6 FROM vms WHERE deleted IS NULL")
+  def non_deleted_vms_by_host_and_network(self, host_id):
+    query = "SELECT id, host, network_name, public_ipv4, public_ipv6 FROM vms WHERE deleted IS NULL"
+    if host_id is None: 
+      self.cursor.execute(query)
+    else:
+      self.cursor.execute(f"{query} AND host = %s", (host_id))
 
     hosts = dict()
     for row in self.cursor.fetchall():
@@ -318,11 +322,15 @@ class DBModel:
 
   #     ------    HOSTS     ---------  
 
-  def list_hosts_with_networks(self):
-    self.cursor.execute("""
+  def list_hosts_with_networks(self, host_id: str):
+    query = """
     SELECT hosts.id, hosts.last_health_check, host_network.network_name, host_network.public_ipv4_cidr_block FROM hosts
     JOIN host_network ON host_network.host = hosts.id
-    """)
+    """
+    if host_id is None: 
+      self.cursor.execute(query)
+    else:
+      self.cursor.execute(f"{query} WHERE hosts.id = %s", (host_id))
 
     hosts = dict()
     for row in self.cursor.fetchall():
@@ -379,6 +387,13 @@ class DBModel:
     self.connection.commit()
     return operation_id
 
+  def update_operation(self, operation_id: int, payload: str):
+    self.cursor.execute(
+      "UPDATE operations SET payload = %s WHERE id = %s", 
+      (payload, operation_id)
+    )
+    self.connection.commit()
+
   def update_host_operation(self, host_id: str, operation_id: int, assignment_status: str, result: str):
     if assignment_status and not result:
       self.cursor.execute(
@@ -405,9 +420,20 @@ class DBModel:
     else:
       return None
 
-  def host_operation_exists(self, operation_id: int, host_id: str) -> bool:
-    self.cursor.execute("SELECT operation FROM host_operation WHERE host = %s AND operation = %s",(host_id, operation_id))
-    return len(self.cursor.fetchall()) != 0
+  def get_payload_json_from_host_operation(self, operation_id: int, host_id: str) -> str:
+    self.cursor.execute(
+      """
+        SELECT operations.payload FROM operations 
+          JOIN host_operation ON host_operation.operation = operations.id
+          WHERE host_operation.host = %s AND host_operation.operation = %s
+      """,
+      (host_id, operation_id)
+    )
+    row = self.cursor.fetchone()
+    if row:
+      return row[0]
+    else:
+      return None
 
   def claim_operation(self, operation_id: int, host_id: str) -> bool:
     # have to make a new cursor to set isolation level