BUG#27040070 : ldap: asan and valgrind issues

Description:
1. Fixed memory leak in ldap sasl server plugin.
2. Fixed memory leak in ldap sasl client side plugin.
3. Suppressed false positive leaks.
4. Fixed test skip issue for el7.

RB: 18860

Author: Yashwant Sahu

libmysql/authentication_ldap/auth_ldap_sasl_client.cc

@@ -36,18 +36,18 @@ void Sasl_client::interact(sasl_interact_t *ilist)
       the name of the user authenticating
     */
     case SASL_CB_USER:
-      ilist->result= strdup(m_user_name);
+      ilist->result= m_user_name;
       ilist->len= strlen((const char*)ilist->result);
       break;
     /* the name of the user acting for. (for example postman delivering mail for
        Martin might have an AUTHNAME of postman and a USER of Martin)
     */
     case SASL_CB_AUTHNAME:
-      ilist->result= strdup(m_user_name);
+      ilist->result= m_user_name;
       ilist->len= strlen((const char*)ilist->result);
       break;
     case SASL_CB_PASS:
-      ilist->result= strdup(m_user_pwd);
+      ilist->result= m_user_pwd;
       ilist->len= strlen((const char*)ilist->result);
       break;
     default:

mysql-test/valgrind.supp

@@ -1,4 +1,4 @@
-# Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Library General Public
@@ -1608,3 +1608,147 @@
   fun:_ZL17plugin_initializeP13st_plugin_int
   ...
 }
+
+# Bug #25964438  LDAP: ASAN AND VALGRIND ISSUES
+{
+   LDAP_TLS_workaround1
+   Memcheck:Leak
+   fun:calloc
+   ...
+   ...
+   ...
+   ...
+   ...
+   fun:ldap_int_tls_start
+   fun:ldap_start_tls_s
+   fun:*establish_tls*
+   fun:*create*
+}
+{
+   LDAP_TLS_workaround2
+   Memcheck:Leak
+   fun:malloc
+   ...
+   ...
+   ...
+   ...
+   ...
+   fun:ldap_int_tls_start
+   fun:ldap_start_tls_s
+   fun:*establish_tls*
+   fun:*create*
+}
+{
+   LDAP_TLS_workaround3
+   Memcheck:Leak
+   fun:calloc
+   fun:PR_LoadLibraryWithFlags
+   ...
+   ...
+   ...
+   fun:PR_CallOnce
+   ...
+   ...
+   fun:_dl_init
+}
+{
+   LDAP_TLS_workaround4
+   Memcheck:Leak
+   fun:malloc
+   fun:PR_ErrorInstallTable
+   fun:PR_CallOnce
+   ...
+   ...
+   fun:PR_CallOnceWithArg
+   ...
+   fun:NSS_SetDomesticPolicy
+   ...
+   fun:PR_CallOnceWithArg
+   ...
+   ...
+   ...
+   fun:ldap_int_tls_start
+   fun:ldap_start_tls_s
+   fun:*establish_tls*
+}
+{
+   LDAP_TLS_workaround5
+   Memcheck:Leak
+   fun:malloc
+   ...
+   fun:PR_LoadLibraryWithFlags
+   ...
+   ...
+   ...
+   fun:PR_CallOnce
+   ...
+   ...
+   ...
+   ...
+   fun:_dl_catch_error
+   fun:_dl_open
+   fun:dlopen_doit
+   fun:_dl_catch_error
+   fun:_dlerror_run
+}
+{
+   LDAP_TLS_workaround6
+   Memcheck:Leak
+   fun:malloc
+   fun:ber_memalloc_x
+   fun:ber_strdup_x
+   ...
+   fun:ldap_int_initialize
+   fun:ldap_create
+   fun:ldap_initialize
+   fun:*create*
+}
+{
+   LDAP_TLS_workaround7
+   Memcheck:Leak
+   fun:malloc
+   fun:*dl_close_worker*
+   fun:*dl_close*
+   fun:*dl_catch_error*
+   fun:*libc_dlclose*
+   fun:*free_mem*
+   fun:*libc_freeres*
+   fun:*vgnU_freeres*
+   fun:*run_exit_handlers*
+   fun:exit*
+   fun:*mysqld_exit*
+   fun:*mysqld_main*
+   fun:*main*
+}
+{
+   LDAP_TLS_workaround8
+   Memcheck:Leak
+   fun:malloc
+   fun:ber_memalloc_x
+   fun:ber_strdup_x
+   ...
+   fun:ldap_int_initialize
+   fun:ldap_set_option
+   fun:*configure_tls*
+}
+{
+   LDAP_TLS_workaround9
+   Memcheck:Leak
+   match-leak-kinds: reachable
+   fun:malloc
+   fun:PR_ErrorInstallTable
+   ...
+   ...
+   ...
+   ...
+   ...
+   ...  
+   ...
+   ...
+   ...
+   ...
+   ...
+   ...
+   fun:ldap_int_tls_start
+   fun:ldap_start_tls_s
+}