Always merge build files

Previous behavior:

- Packge not listed in bp2buildKeepExistingBuildFile:
    - Use bp2build generated build file
- Package listed in bp2buildKeepExistingBuildFile:
    - Use handcrafted build file even if there were allowlisted bp2build
      modules in the same package.
- Package listed in bp2buildKeepExistingBuildFile and a soong module has
  a bp2build: { label } attribute:
    - Merge the handcrafted and bp2build generated build files

New behavior:

- Packge not listed in bp2buildKeepExistingBuildFile:
    - Use bp2build generated build file
- Package listed in bp2buildKeepExistingBuildFile:
    - Merge with bp2build generated build file.

Bug: 234167862
Test: ./build/bazel/ci/bp2build.sh
Change-Id: Ifbaf4f8f0f5158b5b2bd6d534eb2311e2e5f399b
diff --git a/android/bazel_test.go b/android/bazel_test.go
index 98f0a46..b578cca 100644
--- a/android/bazel_test.go
+++ b/android/bazel_test.go
@@ -158,7 +158,7 @@
 
 type TestBazelConversionContext struct {
 	omc       bazel.OtherModuleTestContext
-	allowlist bp2BuildConversionAllowlist
+	allowlist Bp2BuildConversionAllowlist
 	errors    []string
 }
 
@@ -183,7 +183,7 @@
 func (bcc *TestBazelConversionContext) Config() Config {
 	return Config{
 		&config{
-			bp2buildPackageConfig: bcc.allowlist,
+			Bp2buildPackageConfig: bcc.allowlist,
 		},
 	}
 }
@@ -202,7 +202,7 @@
 		shouldConvert  bool
 		expectedErrors []string
 		module         TestBazelModule
-		allowlist      bp2BuildConversionAllowlist
+		allowlist      Bp2BuildConversionAllowlist
 	}{
 		{
 			description:   "allowlist enables module",
@@ -215,7 +215,7 @@
 				},
 				BazelModuleBase: bazelableBazelModuleBase,
 			},
-			allowlist: bp2BuildConversionAllowlist{
+			allowlist: Bp2BuildConversionAllowlist{
 				moduleAlwaysConvert: map[string]bool{
 					"foo": true,
 				},
@@ -233,7 +233,7 @@
 				},
 				BazelModuleBase: bazelableBazelModuleBase,
 			},
-			allowlist: bp2BuildConversionAllowlist{
+			allowlist: Bp2BuildConversionAllowlist{
 				moduleAlwaysConvert: map[string]bool{
 					"foo": true,
 				},
@@ -254,7 +254,7 @@
 				},
 				BazelModuleBase: bazelableBazelModuleBase,
 			},
-			allowlist: bp2BuildConversionAllowlist{
+			allowlist: Bp2BuildConversionAllowlist{
 				moduleAlwaysConvert: map[string]bool{
 					"foo": true,
 				},
@@ -264,27 +264,6 @@
 			},
 		},
 		{
-			description:    "module in allowlist and existing BUILD file",
-			shouldConvert:  false,
-			expectedErrors: []string{"A module cannot be in a directory listed in keepExistingBuildFile and also be in moduleAlwaysConvert. Directory: 'existing/build/dir'"},
-			module: TestBazelModule{
-				TestModuleInfo: bazel.TestModuleInfo{
-					ModuleName: "foo",
-					Typ:        "rule1",
-					Dir:        "existing/build/dir",
-				},
-				BazelModuleBase: bazelableBazelModuleBase,
-			},
-			allowlist: bp2BuildConversionAllowlist{
-				moduleAlwaysConvert: map[string]bool{
-					"foo": true,
-				},
-				keepExistingBuildFile: map[string]bool{
-					"existing/build/dir": true,
-				},
-			},
-		},
-		{
 			description:    "module allowlist and enabled directory",
 			shouldConvert:  false,
 			expectedErrors: []string{"A module cannot be in a directory marked Bp2BuildDefaultTrue or Bp2BuildDefaultTrueRecursively and also be in moduleAlwaysConvert. Directory: 'existing/build/dir'"},
@@ -296,7 +275,7 @@
 				},
 				BazelModuleBase: bazelableBazelModuleBase,
 			},
-			allowlist: bp2BuildConversionAllowlist{
+			allowlist: Bp2BuildConversionAllowlist{
 				moduleAlwaysConvert: map[string]bool{
 					"foo": true,
 				},
@@ -317,7 +296,7 @@
 				},
 				BazelModuleBase: bazelableBazelModuleBase,
 			},
-			allowlist: bp2BuildConversionAllowlist{
+			allowlist: Bp2BuildConversionAllowlist{
 				moduleAlwaysConvert: map[string]bool{
 					"foo": true,
 				},
@@ -344,7 +323,7 @@
 					},
 				},
 			},
-			allowlist: bp2BuildConversionAllowlist{
+			allowlist: Bp2BuildConversionAllowlist{
 				moduleAlwaysConvert: map[string]bool{
 					"foo": true,
 				},