Fixes installation nightly test by filtering out the git commands

tests/jenkins/run_test_installation_docs.sh

@@ -250,6 +250,20 @@ function set_instruction_set() {
         ${sorted_indexes[$end_buildfromsource_command_index]})
 }
 
+# given a build commands string, filter any build commands that ought not be executed
+# during the test. An example would be git clone'ing the mxnet repository. You want to 
+# run the tests against the current commit being tested in Jenkins.
+function filter_build_commands() {
+    filtered_build_commands="${1}"
+
+    # Remove git commands
+    filtered_build_commands=`echo "${filtered_build_commands}" | perl -pe 's/git .*?;//g'`
+
+    # Remove 'cd incubator-mxnet'
+    filtered_build_commands=`echo "${filtered_build_commands}" | perl -pe 's/cd incubator-mxnet;//'`
+
+    echo "${filtered_build_commands}"
+}
 
 ########################LINUX-PYTHON-CPU############################
 echo
@@ -302,8 +316,8 @@ ubuntu_python_cpu_source()
     set -e
     echo
     echo "### Testing Build From Source ###"
-    echo "${buildfromsource_commands}"
-    echo
+    buildfromsource_commands=$(filter_build_commands "${buildfromsource_commands}")
+    echo ${buildfromsource_commands}
     eval ${buildfromsource_commands}
     echo "ubuntu_python_cpu_source: MXNet Installed Successfully"
 
@@ -364,7 +378,8 @@ ubuntu_python_gpu_source()
     echo
     echo "### Testing Build From Source ###"
     echo "${buildfromsource_commands}"
-    echo
+    buildfromsource_commands=$(filter_build_commands "${buildfromsource_commands}")
+    echo ${buildfromsource_commands}
     eval ${buildfromsource_commands}
     echo "ubuntu_python_gpu_source: MXNet Installed Successfully"