Revert "Explicitly set the user option for ssh connections"

This reverts commit 0f91add8.

Fixes #8216

lib/ansible/runner/connection_plugins/ssh.py

@@ -94,7 +94,8 @@ class Connection(object):
             self.common_args += ["-o", "KbdInteractiveAuthentication=no",
                                  "-o", "PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey",
                                  "-o", "PasswordAuthentication=no"]
-        self.common_args += ["-o", "User=" + (self.user or pwd.getpwuid(os.geteuid())[0])]
+        if self.user != pwd.getpwuid(os.geteuid())[0]:
+            self.common_args += ["-o", "User="+self.user]
         self.common_args += ["-o", "ConnectTimeout=%d" % self.runner.timeout]
 
         return self