Fix issue of branch switching not working with bazel
Fix issue of branch switching not working with bazel

This fix tries to address the issue raised in 15957 where
bazel stops working after switching git branch, and
reconfigure with `./configure` will not work as well.

This fix adds a quick fix as was suggested, by having
export TF_CONFIG_TIME="$(date)" in configure.py and add
it to the environ list in git_configure.bzl.

This fix fixes 15957.

Signed-off-by: Yong Tang <765086fe2e0c1f980161f127fec596800f327f62@outlook.com>

Intel-tensorflow/tensorflow,theflofly/tensorflow,meteorcloudy/tensorflow,arborh/tensorflow,aam-at/tensorflow,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow-experimental_link_static_libraries_once,chemelnucfin/tensorflow,nolanliou/tensorflow,girving/tensorflow,gautam1858/tensorflow,gojira/tensorflow,nolanliou/tensorflow,jalexvig/tensorflow,zasdfgbnm/tensorflow,kobejean/tensorflow,lukeiwanski/tensorflow,eaplatanios/tensorflow,Bismarrck/tensorflow,alsrgv/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,adit-chandra/tensorflow,frreiss/tensorflow-fred,alshedivat/tensorflow,dancingdan/tensorflow,lukeiwanski/tensorflow,frreiss/tensorflow-fred,manipopopo/tensorflow,jhseu/tensorflow,yongtang/tensorflow,xodus7/tensorflow,jbedorf/tensorflow,davidzchen/tensorflow,nolanliou/tensorflow,kevin-coder/tensorflow-fork,theflofly/tensorflow,dancingdan/tensorflow,gautam1858/tensorflow,ppwwyyxx/tensorflow,Intel-tensorflow/tensorflow,girving/tensorflow,jhseu/tensorflow,nburn42/tensorflow,av8ramit/tensorflow,manipopopo/tensorflow,xzturn/tensorflow,kevin-coder/tensorflow-fork,tensorflow/tensorflow-pywrap_saved_model,tensorflow/tensorflow,xodus7/tensorflow,frreiss/tensorflow-fred,freedomtan/tensorflow,ravindrapanda/tensorflow,hfp/tensorflow-xsmm,Xeralux/tensorflow,renyi533/tensorflow,AnishShah/tensorflow,arborh/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,gojira/tensorflow,gunan/tensorflow,jhseu/tensorflow,kevin-coder/tensorflow-fork,jbedorf/tensorflow,drpngx/tensorflow,ageron/tensorflow,freedomtan/tensorflow,seanli9jan/tensorflow,ZhangXinNan/tensorflow,av8ramit/tensorflow,DavidNorman/tensorflow,aam-at/tensorflow,dongjoon-hyun/tensorflow,gojira/tensorflow,frreiss/tensorflow-fred,hehongliang/tensorflow,nburn42/tensorflow,hehongliang/tensorflow,Intel-Corporation/tensorflow,chemelnucfin/tensorflow,arborh/tensorflow,jendap/tensorflow,Xeralux/tensorflow,tensorflow/tensorflow,jbedorf/tensorflow,rabipanda/tensorflow,eaplatanios/tensorflow,av8ramit/tensorflow,ppwwyyxx/tensorflow,seanli9jan/tensorflow,aselle/tensorflow,allenlavoie/tensorflow,theflofly/tensorflow,petewarden/tensorflow,DavidNorman/tensorflow,renyi533/tensorflow,zasdfgbnm/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,freedomtan/tensorflow,benoitsteiner/tensorflow-xsmm,tensorflow/tensorflow,brchiu/tensorflow,jart/tensorflow,alsrgv/tensorflow,hfp/tensorflow-xsmm,frreiss/tensorflow-fred,hfp/tensorflow-xsmm,alshedivat/tensorflow,sarvex/tensorflow,renyi533/tensorflow,Intel-tensorflow/tensorflow,ravindrapanda/tensorflow,jhseu/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,gautam1858/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,girving/tensorflow,xzturn/tensorflow,renyi533/tensorflow,freedomtan/tensorflow,drpngx/tensorflow,DavidNorman/tensorflow,xzturn/tensorflow,paolodedios/tensorflow,apark263/tensorflow,benoitsteiner/tensorflow-xsmm,arborh/tensorflow,benoitsteiner/tensorflow-xsmm,jendap/tensorflow,gautam1858/tensorflow,ghchinoy/tensorflow,hfp/tensorflow-xsmm,meteorcloudy/tensorflow,gunan/tensorflow,jendap/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,Bismarrck/tensorflow,zasdfgbnm/tensorflow,nolanliou/tensorflow,cxxgtxy/tensorflow,yongtang/tensorflow,petewarden/tensorflow,aselle/tensorflow,caisq/tensorflow,apark263/tensorflow,gautam1858/tensorflow,Bismarrck/tensorflow,adit-chandra/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,yongtang/tensorflow,arborh/tensorflow,drpngx/tensorflow,ravindrapanda/tensorflow,manipopopo/tensorflow,manipopopo/tensorflow,gunan/tensorflow,dancingdan/tensorflow,Intel-Corporation/tensorflow,aselle/tensorflow,aselle/tensorflow,nburn42/tensorflow,ZhangXinNan/tensorflow,caisq/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,allenlavoie/tensorflow,eaplatanios/tensorflow,Bismarrck/tensorflow,lukeiwanski/tensorflow,jart/tensorflow,gojira/tensorflow,tensorflow/tensorflow-pywrap_saved_model,dongjoon-hyun/tensorflow,dongjoon-hyun/tensorflow,jalexvig/tensorflow,xzturn/tensorflow,yanchen036/tensorflow,tensorflow/tensorflow-experimental_link_static_libraries_once,jalexvig/tensorflow,jhseu/tensorflow,jendap/tensorflow,tensorflow/tensorflow-pywrap_saved_model,girving/tensorflow,allenlavoie/tensorflow,ghchinoy/tensorflow,girving/tensorflow,xodus7/tensorflow,xzturn/tensorflow,Intel-tensorflow/tensorflow,dongjoon-hyun/tensorflow,frreiss/tensorflow-fred,Xeralux/tensorflow,aldian/tensorflow,AnishShah/tensorflow,karllessard/tensorflow,karllessard/tensorflow,tensorflow/tensorflow-pywrap_tf_optimizer,lukeiwanski/tensorflow,alshedivat/tensorflow,ZhangXinNan/tensorflow,yongtang/tensorflow,petewarden/tensorflow,meteorcloudy/tensorflow,jalexvig/tensorflow,ravindrapanda/tensorflow,manipopopo/tensorflow,allenlavoie/tensorflow,snnn/tensorflow,manipopopo/tensorflow,paolodedios/tensorflow,aam-at/tensorflow,aldian/tensorflow,DavidNorman/tensorflow,jendap/tensorflow,DavidNorman/tensorflow,alshedivat/tensorflow,meteorcloudy/tensorflow,cxxgtxy/tensorflow,alsrgv/tensorf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