Docs: Fix SessionFactory code example for ftp/sftp

Fixes: #10888

The `setTestSession()` method is available in `CachingSessionFactory`, but not in the `DefaultFtpSessionFactory` or `DefaultSftpSessionFactory` implementations.

Signed-off-by: Jiandong Ma <jiandong.ma.cn@gmail.com>

(cherry picked from commit 0bc5177)

Author: mjd507

src/reference/antora/modules/ROOT/pages/ftp/inbound.adoc

@@ -237,7 +237,6 @@ public class FtpJavaApplication {
         sf.setPort(port);
         sf.setUsername("foo");
         sf.setPassword("foo");
-        sf.setTestSession(true);
         return new CachingSessionFactory<FTPFile>(sf);
     }
 

src/reference/antora/modules/ROOT/pages/ftp/outbound-gateway.adoc

@@ -327,7 +327,6 @@ public class FtpJavaApplication {
         sf.setPort(port);
         sf.setUsername("foo");
         sf.setPassword("foo");
-        sf.setTestSession(true);
         return new CachingSessionFactory<FTPFile>(sf);
     }
 
@@ -366,7 +365,6 @@ public class FtpJavaApplication {
         sf.setPort(port);
         sf.setUsername("foo");
         sf.setPassword("foo");
-        sf.setTestSession(true);
         return new CachingSessionFactory<FTPFile>(sf);
     }
 

src/reference/antora/modules/ROOT/pages/ftp/outbound.adoc

@@ -101,7 +101,6 @@ public class FtpJavaApplication {
         sf.setPort(port);
         sf.setUsername("foo");
         sf.setPassword("foo");
-        sf.setTestSession(true);
         return new CachingSessionFactory<FTPFile>(sf);
     }
 
@@ -158,7 +157,6 @@ public class FtpJavaApplication {
         sf.setPort(port);
         sf.setUsername("foo");
         sf.setPassword("foo");
-        sf.setTestSession(true);
         return new CachingSessionFactory<FTPFile>(sf);
     }
 

src/reference/antora/modules/ROOT/pages/sftp/inbound.adoc

@@ -204,7 +204,6 @@ public class SftpJavaApplication {
         factory.setUser("foo");
         factory.setPassword("foo");
         factory.setAllowUnknownKeys(true);
-        factory.setTestSession(true);
         return new CachingSessionFactory<>(factory);
     }
 

src/reference/antora/modules/ROOT/pages/sftp/outbound-gateway.adoc

@@ -333,7 +333,6 @@ public class SftpJavaApplication {
         sf.setPort(port);
         sf.setUsername("foo");
         sf.setPassword("foo");
-        factory.setTestSession(true);
         return new CachingSessionFactory<>(sf);
     }
 

src/reference/antora/modules/ROOT/pages/sftp/outbound.adoc

@@ -98,7 +98,6 @@ public class SftpJavaApplication {
         factory.setUser("foo");
         factory.setPassword("foo");
         factory.setAllowUnknownKeys(true);
-        factory.setTestSession(true);
         return new CachingSessionFactory<SftpClient.DirEntry>(factory);
     }