Support centos6 and centos7

tests/dockerfiles/ubuntu14/Dockerfile

@@ -3,16 +3,16 @@ FROM ubuntu:14.04
 RUN useradd -ms /bin/bash user
 
 RUN apt-get update && \
-    apt-get install -y \
-		curl \
-	  build-essential \
-		libbz2-dev \
-		libffi-dev \
-		libncurses5-dev \
-		libreadline-dev \
-		libssl-dev \
-		sudo \
-		wget \
+		apt-get install -y \
+			curl \
+			build-essential \
+			libbz2-dev \
+			libffi-dev \
+			libncurses5-dev \
+			libreadline-dev \
+			libssl-dev \
+			sudo \
+			wget \
 		&& rm -rf /var/lib/apt/lists/*
 
 WORKDIR /opt/