test=develop, fix multigpu hang on latest docker (#18381)

Author: JiabinYang

paddle/scripts/paddle_build.sh

@@ -847,7 +847,6 @@ EOF
     ${DOCKERFILE_CUDNN_DSO}
     ${DOCKERFILE_CUBLAS_DSO}
     ${DOCKERFILE_GPU_ENV}
-    ENV NCCL_LAUNCH_MODE PARALLEL
 EOF
     elif [ "$1" == "cp36-cp36m" ]; then
         cat >> ${PADDLE_ROOT}/build/Dockerfile <<EOF
@@ -873,7 +872,6 @@ EOF
     ${DOCKERFILE_CUDNN_DSO}
     ${DOCKERFILE_CUBLAS_DSO}
     ${DOCKERFILE_GPU_ENV}
-    ENV NCCL_LAUNCH_MODE PARALLEL
 EOF
     elif [ "$1" == "cp37-cp37m" ]; then
         cat >> ${PADDLE_ROOT}/build/Dockerfile <<EOF
@@ -896,7 +894,6 @@ EOF
     ${DOCKERFILE_CUDNN_DSO}
     ${DOCKERFILE_CUBLAS_DSO}
     ${DOCKERFILE_GPU_ENV}
-    ENV NCCL_LAUNCH_MODE PARALLEL
 EOF
     else
         cat >> ${PADDLE_ROOT}/build/Dockerfile <<EOF
@@ -912,7 +909,6 @@ EOF
     ${DOCKERFILE_CUDNN_DSO}
     ${DOCKERFILE_CUBLAS_DSO}
     ${DOCKERFILE_GPU_ENV}
-    ENV NCCL_LAUNCH_MODE PARALLEL
 EOF
     fi