Get the correct include path in pip package (#13452)
Get the correct include path in pip package (#13452)

* add find_include_path API

* address reviewer comment

* change return type from list to string

* add unit test

* address reviewer comment

* address reviewer comment

* address reviewer comment

* address reviewer comment

* fix include path problem in pip package

* add comment

* fix lint error

* address reviewer comment

* address reviewer comment

ptrendx/mxnet,dmlc/mxnet,tlby/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,tlby/mxnet,ptrendx/mxnet,ptrendx/mxnet,apache/incubator-mxnet,leezu/mxnet,reminisce/mxnet,larroy/mxnet,yajiedesign/mxnet,ptrendx/mxnet,sxjscience/mxnet,reminisce/mxnet,szha/mxnet,yajiedesign/mxnet,yajiedesign/mxnet,larroy/mxnet,dmlc/mxnet,szha/mxnet,ptrendx/mxnet,dmlc/mxnet,sxjscience/mxnet,szha/mxnet,dmlc/mxnet,apache/incubator-mxnet,reminisce/mxnet,larroy/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,larroy/mxnet,ptrendx/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,zhreshold/mxnet,reminisce/mxnet,tlby/mxnet,zhreshold/mxnet,szha/mxnet,eric-haibin-lin/mxnet,ptrendx/mxnet,tlby/mxnet,DickJC123/mxnet,eric-haibin-lin/mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,yajiedesign/mxnet,dmlc/mxnet,ptrendx/mxnet,tlby/mxnet,apache/incubator-mxnet,szha/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,larroy/mxnet,tlby/mxnet,DickJC123/mxnet,sxjscience/mxnet,reminisce/mxnet,yajiedesign/mxnet,leezu/mxnet,tlby/mxnet,larroy/mxnet,zhreshold/mxnet,ptrendx/mxnet,dmlc/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,reminisce/mxnet,tlby/mxnet,leezu/mxnet,leezu/mxnet,leezu/mxnet,leezu/mxnet,larroy/mxnet,sxjscience/mxnet,szha/mxnet,DickJC123/mxnet,szha/mxnet,zhreshold/mxnet,eric-haibin-lin/mxnet,yajiedesign/mxnet,sxjscience/mxnet,sxjscience/mxnet,reminisce/mxnet,dmlc/mxnet,reminisce/mxnet,leezu/mxnet,sxjscience/mxnet,larroy/mxnet,reminisce/mxnet,ptrendx/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,leezu/mxnet,DickJC123/mxnet,eric-haibin-lin/mxnet,yajiedesign/mxnet,apache/incubator-mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,szha/mxnet,leezu/mxnet,zhreshold/mxnet,szha/mxnet,sxjscience/mxnet,larroy/mxnet,ForkedReposBak/mxnet