Ticket 50709: (cont) Several memory leaks reported by Valgrind for 389-ds 1.3.9.1-10
    
    Bug Description:
    	Cherry pick from master was broken because connection locking
    	uses pthread lock in master while it remains Monitor in 1.3.10
    
    Fix Description:
    	Change the locking function to use Monitor in that branch
    
    https://pagure.io/389-ds-base/issue/50709
    
    Reviewed by: thierry bordaz
    
    Platforms tested: 7.8
    
    Flag Day: no
    
    Doc impact: no