Pin grpcio, install importresource pkg

We need to test if build problems are helped by using an older version
than 1.70.0. robotframework-importresource also needs to be added to
requirements.

Signed-off-by: Eric Ball <eball@linuxfoundation.org>
Change-Id: Iee809591f61e32edfaf681c38d089c436283d2ae
diff --git a/requirements.txt b/requirements.txt
index 4223aa6..ee275df 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,6 +29,7 @@
 # https://pypi.org/project/robotframework/#history
 # -----------------------------------------------------------------------
 robotframework
+robotframework-importresource
 robotframework-kafkalibrary
 robotframework-lint
 robotframework-requests
@@ -48,6 +49,7 @@
 
 matplotlib
 requests
+grpcio~=1.48.2
 grpc-robot>=2.9.3
 kafka-robot>=2.3.2
 voltha-protos>=4.2.0