Wait for setup of server threads

Test NDR32

ndr32: disable NDR64

ndr32:in => out: ptype[request] flen[31] plen[7] ahint[7]

[000] 01 00 56 00 01 00 43                              ..V...C 

srv_midltests_fn: Start
srv_midltests_fn: End

ndr32:out => in: ptype[response] flen[28] plen[4] ahint[4]

[000] 54 72 75 65                                       True 

NDRTcpThread[ndr32] stop

Test NDR64

ndr64: got NDR64

ndr64:in => out: ptype[request] flen[31] plen[7] ahint[7]

[000] 01 00 56 00 01 00 43                              ..V...C 

srv_midltests_fn: Start
srv_midltests_fn: End

ndr64:out => in: ptype[response] flen[28] plen[4] ahint[4]

[000] 54 72 75 65                                       True 

NDRTcpThread[ndr64] stop

Test OK