[FLINK-8765] [quickstarts] Simplify quickstart properties

This does not pull out the slf4j and log4j version into properties any more,
making the quickstarts a bit simpler.

Given that both versions are used only once, and only for the feature to have
convenience logging in the IDE, the versions might as well be defined directly
in the dependencies.

flink-quickstart/flink-quickstart-java/src/main/resources/archetype-resources/pom.xml

@@ -31,8 +31,6 @@ under the License.
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<flink.version>@project.version@</flink.version>
-		<slf4j.version>@slf4j.version@</slf4j.version>
-		<log4j.version>@log4j.version@</log4j.version>
 		<scala.binary.version>@scala.binary.version@</scala.binary.version>
 	</properties>
 
@@ -82,13 +80,13 @@ under the License.
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-log4j12</artifactId>
-			<version>${slf4j.version}</version>
+			<version>1.7.7</version>
 			<scope>runtime</scope>
 		</dependency>
 		<dependency>
 			<groupId>log4j</groupId>
 			<artifactId>log4j</artifactId>
-			<version>${log4j.version}</version>
+			<version>1.2.17</version>
 			<scope>runtime</scope>
 		</dependency>
 	</dependencies>

flink-quickstart/flink-quickstart-scala/src/main/resources/archetype-resources/pom.xml

@@ -46,8 +46,6 @@ under the License.
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<flink.version>@project.version@</flink.version>
-		<slf4j.version>@slf4j.version@</slf4j.version>
-		<log4j.version>@log4j.version@</log4j.version>
 		<scala.binary.version>2.11</scala.binary.version>
 		<scala.version>2.11.12</scala.version>
 	</properties>
@@ -92,13 +90,13 @@ under the License.
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-log4j12</artifactId>
-			<version>${slf4j.version}</version>
+			<version>1.7.7</version>
 			<scope>runtime</scope>
 		</dependency>
 		<dependency>
 			<groupId>log4j</groupId>
 			<artifactId>log4j</artifactId>
-			<version>${log4j.version}</version>
+			<version>1.2.17</version>
 			<scope>runtime</scope>
 		</dependency>
 	</dependencies>