remove port prefix requirement (#2590)

* remove port prefix requirement

* chore: remove depcrated test and fix lint

* add changelog entry

* Update CHANGELOG.md

Co-authored-by: Damian Nolan <damiannolan@gmail.com>

Co-authored-by: Damian Nolan <damiannolan@gmail.com>
(cherry picked from commit 5f9966b)

# Conflicts:
#	modules/apps/27-interchain-accounts/host/keeper/handshake.go

CHANGELOG.md

@@ -42,6 +42,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### State Machine Breaking
 
+* (27-interchain-accounts) [\#2580](https://github.com/cosmos/ibc-go/issues/2580) Removing port prefix requirement from the ICA host channel handshake
 * (transfer) [\#2377](https://github.com/cosmos/ibc-go/pull/2377) Adding `sequence` to `MsgTransferResponse`.
 
 ### Improvements

modules/apps/27-interchain-accounts/host/keeper/handshake.go

@@ -2,7 +2,6 @@ package keeper
 
 import (
 	"fmt"
-	"strings"
 
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
@@ -35,10 +34,13 @@ func (k Keeper) OnChanOpenTry(
 		return "", sdkerrors.Wrapf(icatypes.ErrInvalidHostPort, "expected %s, got %s", icatypes.PortID, portID)
 	}
 
+<<<<<<< HEAD
 	if !strings.HasPrefix(counterparty.PortId, icatypes.PortPrefix) {
 		return "", sdkerrors.Wrapf(icatypes.ErrInvalidControllerPort, "expected %s{owner-account-address}, got %s", icatypes.PortPrefix, counterparty.PortId)
 	}
 
+=======
+>>>>>>> 5f9966b (remove port prefix requirement (#2590))
 	var metadata icatypes.Metadata
 	if err := icatypes.ModuleCdc.UnmarshalJSON([]byte(counterpartyVersion), &metadata); err != nil {
 		return "", sdkerrors.Wrapf(icatypes.ErrUnknownDataType, "cannot unmarshal ICS-27 interchain accounts metadata")

modules/apps/27-interchain-accounts/host/keeper/handshake_test.go

@@ -171,13 +171,6 @@ func (suite *KeeperTestSuite) TestOnChanOpenTry() {
 			},
 			false,
 		},
-		{
-			"invalid counterparty port ID",
-			func() {
-				channel.Counterparty.PortId = "invalid-port-id"
-			},
-			false,
-		},
 		{
 			"connection not found",
 			func() {