networks/remote: turn on GO111MODULE and use git clone instead of go get (#4203)

To execute the integration.sh, you need to run  "source ./integration.sh".  just execute command "./integration.sh" will not work. 

It is because "source ~/.profile" executes in a separate shell than the integration.sh script 
# **turn on the go module, default is auto. The value is off, if tendermint source code
#is downloaded under $GOPATH/src directory

echo "export GO111MODULE=on" >> ~/.profile

# ** use git clone instead of go get.
# once go module is on, go get will download source code to
# specific version directory under $GOPATH/pkg/mod the make
# script will not work
git clone https://github.com/tendermint/tendermint.git

#** need to install the package, otherwise tendermint testnet will not execute
make install

networks/remote/integration.sh

@@ -3,7 +3,7 @@
 # XXX: this script is intended to be run from a fresh Digital Ocean droplet
 
 # NOTE: you must set this manually now
-echo "export DO_API_TOKEN=\"yourToken\"" >> ~/.profile
+echo "export DO_API_TOKEN=\"yourtoken\"" >> ~/.profile
 
 sudo apt-get update -y
 sudo apt-get upgrade -y
@@ -21,17 +21,25 @@ echo "export PATH=\$PATH:/usr/local/go/bin" >> ~/.profile
 mkdir goApps
 echo "export GOPATH=/root/goApps" >> ~/.profile
 echo "export PATH=\$PATH:\$GOPATH/bin" >> ~/.profile
+# **turn on the go module, default is auto. The value is off, if tendermint source code
+#is downloaded under $GOPATH/src directory
+echo "export GO111MODULE=on" >> ~/.profile
 
 source ~/.profile
 
-## get the code and move into repo
-REPO=github.com/tendermint/tendermint
-go get $REPO
-cd $GOPATH/src/$REPO
-
+mkdir -p $GOPATH/src/github.com/tendermint
+cd $GOPATH/src/github.com/tendermint
+# ** use git clone instead of go get.
+# once go module is on, go get will download source code to
+# specific version directory under $GOPATH/pkg/mod the make
+# script will not work
+git clone https://github.com/tendermint/tendermint.git
+cd tendermint
 ## build
 make tools
 make build
+#** need to install the package, otherwise terdermint testnet will not execute
+make install
 
 # generate an ssh key
 ssh-keygen -f $HOME/.ssh/id_rsa -t rsa -N ''