GH#354 Disabled auth submodules config when related setting is false

This should help with #354.
The problem is that I have no idea whether such auth submodules configuration
is required even when settings.submodules is false.

__test__/git-auth-helper.test.ts

@@ -482,6 +482,7 @@ describe('git-auth-helper tests', () => {
       )
       settings.persistCredentials = false
       settings.sshKey = ''
+      settings.submodules = true
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
       const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
@@ -515,6 +516,7 @@ describe('git-auth-helper tests', () => {
         configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsFalseAndSshKeySet
       )
       settings.persistCredentials = false
+      settings.submodules = true
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
       const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
@@ -541,6 +543,7 @@ describe('git-auth-helper tests', () => {
         configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeyNotSet
       )
       settings.sshKey = ''
+      settings.submodules = true
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
       const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>
@@ -580,6 +583,7 @@ describe('git-auth-helper tests', () => {
       await setup(
         configureSubmoduleAuth_configuresSubmodulesWhenPersistCredentialsTrueAndSshKeySet
       )
+      settings.submodules = true
       const authHelper = gitAuthHelper.createAuthHelper(git, settings)
       await authHelper.configureAuth()
       const mockSubmoduleForeach = git.submoduleForeach as jest.Mock<any, any>

src/git-auth-helper.ts

@@ -364,11 +364,13 @@ class GitAuthHelper {
       }
     }
 
-    const pattern = regexpHelper.escape(configKey)
-    await this.git.submoduleForeach(
-      // wrap the pipeline in quotes to make sure it's handled properly by submoduleForeach, rather than just the first part of the pipeline
-      `sh -c "git config --local --name-only --get-regexp '${pattern}' && git config --local --unset-all '${configKey}' || :"`,
-      true
-    )
+    if (this.settings.submodules) {
+      const pattern = regexpHelper.escape(configKey)
+      await this.git.submoduleForeach(
+        // wrap the pipeline in quotes to make sure it's handled properly by submoduleForeach, rather than just the first part of the pipeline
+        `sh -c "git config --local --name-only --get-regexp '${pattern}' && git config --local --unset-all '${configKey}' || :"`,
+        true
+      )
+    }
   }
 }