Tomcat logs SEVERE error when site is redeployed

When the site war is redeployed, Cargo logs the following error:

SEVERE: The web application [/site] created a ThreadLocal with key of type [java.lang.ThreadLocal] (value [java.lang.ThreadLocal@524b9e7c]) and a value of type [org.hippoecm.hst.core.jcr.pool.BasicPoolingRepository] (value [org.hippoecm.hst.core.jcr.pool.BasicPoolingRepository@62920919]) but failed to remove it when the web application was stopped. This is very likely to create a memory leak.

Steps to reproduce:

1. create a new site with the archetype:

$ mvn archetype:generate \
-DarchetypeRepository=http://maven.onehippo.com/maven2 \
-DarchetypeGroupId=org.onehippo.cms7 \
-DarchetypeArtifactId=hippo-archetype-website \
-DarchetypeVersion=1.03.00

2. compile the project and start Cargo:

$ mvn clean install
$ mvn -P cargo.run

3. in a second shell, recompile and redeploy the site

$ cd site
$ mvn package cargo:redeploy

Cargo will then log the error in the first shell.