adding lxml and requests packages with specific version to requirements.txt

Author: Alex Azarh

package/requirements.txt

@@ -1,3 +1,5 @@
+lxml==3.8.0
+requests==2.18.4
 cloudshell-automation-api>=8.0.0.0,<8.1.0.0
 cloudshell-core>=2.0.0,<2.1.0
 pyvmomi==6.5.0