CI docker revamp; Add Jetson, Raspberry and CentOS 7 build [MXNET-42][MXNET-43] (apache#9995)

* Start dockerfile revamp

* Fix lint

* Fix lint

* Fix lint

* Add python unit test

* Add new dependency

* Add user creation

* Fix file permission

* Determine USER_ID automatically

* REmove ENV command in dockerfile

* Remove python nose timer, improve useradd

* ENable nvidia docker

* Add remaining unittests

* Add CentOS 7 unittests

* Add integration tests

* Add TVM and LLVM to dockerfile

* Add ARMv7 and ARMv8 to build

* Fix amalgamation build

* Improvements and android_arm64 fixes, missing removing pthread

* Jetson fix (install unzip)

* Build jetson with make until issue with libomp.so is resolved apache#10011

* Fix Amalgamation builds

* Fix Jetson build by switching to cmake

* Assign CentOS gpu test to gpu instance

* Fix R builds

* Assign jobs to right docker containers

* Fix missing file permissions inside docker

* Create homedir on centos

* Enable lapack

* Fix Lapack on Cent OS 7

* Disable MXNET_MKLDNN_DEBUG

* Delete Dockerfiles

* Last general refinements before finish

* Remove docker_multiarch folder, superseeded by the new ci scripts

* Address review comments

* Fix Caffe Integrationstest

* Fix deploy stage

* Address review comments

* Address review comments

* Enable script to run on Mac

Author: marcoabreu

.mxnet_root

@@ -15,6 +15,7 @@ mxnet_option(USE_NCCL             "Use NVidia NCCL with CUDA" OFF)
 mxnet_option(USE_OPENCV           "Build with OpenCV support" ON)
 mxnet_option(USE_OPENMP           "Build with Openmp support" ON)
 mxnet_option(USE_CUDNN            "Build with cudnn support"  ON) # one could set CUDNN_ROOT for search path
+mxnet_option(USE_SSE              "Build with x86 SSE instruction support" AUTO)
 mxnet_option(USE_LAPACK           "Build with lapack support" ON IF NOT MSVC)
 mxnet_option(USE_MKL_IF_AVAILABLE "Use MKL if found" ON)
 mxnet_option(USE_MKLML_MKL        "Use MKLDNN variant of MKL (if MKL found)" ON IF USE_MKL_IF_AVAILABLE AND UNIX AND (NOT APPLE))
@@ -90,11 +91,17 @@ if(MSVC)
 else(MSVC)
   include(CheckCXXCompilerFlag)
   if(USE_CXX14_IF_AVAILABLE)
-    check_cxx_compiler_flag("-std=c++14"   SUPPORT_CXX14)
+    check_cxx_compiler_flag("-std=c++14" SUPPORT_CXX14)
   endif()
   check_cxx_compiler_flag("-std=c++11"   SUPPORT_CXX11)
   check_cxx_compiler_flag("-std=c++0x"   SUPPORT_CXX0X)
-  check_cxx_compiler_flag("-msse2"       SUPPORT_MSSE2)
+  # For cross compilation, we can't rely on the compiler which accepts the flag, but mshadow will
+  # add platform specific includes not available in other arches
+  if(USE_SSE STREQUAL "AUTO")
+    check_cxx_compiler_flag("-msse2"     SUPPORT_MSSE2)
+  else()
+    set(SUPPORT_MSSE2 FALSE)
+  endif()
   set(CMAKE_C_FLAGS "-Wall -Wno-unknown-pragmas -fPIC -Wno-sign-compare")
   if ("${CMAKE_CXX_COMPILER_ID}" MATCHES ".*Clang$")
     set(CMAKE_C_FLAGS "-Wno-braced-scalar-init")