Merge pull request #1393 from stanley-cheung/minor_update_php_dockerfile

php dockerfile: one dependency was listed twice
diff --git a/tools/dockerfile/grpc_php_base/Dockerfile b/tools/dockerfile/grpc_php_base/Dockerfile
index c49d3fe..23e95ba 100644
--- a/tools/dockerfile/grpc_php_base/Dockerfile
+++ b/tools/dockerfile/grpc_php_base/Dockerfile
@@ -58,7 +58,6 @@
     libyaml-dev \
     make \
     patch \
-    procps \
     php5-common \
     php5-cli \
     php5-dev \