Configuration of proxy in HTTP client is not retrieved correctly

[almex]

Since last tests, it seems that the PropertyPlaceholderConfigurer originaly configured in the
httpclient-layer/src/main/resources/spring/streamer/components/raildelays-streamer-context.xml
is not correctly overridden in the
batch-layer/src/main/resources/spring/bootstrap-context.xml.

Incriminated configuration line:

<context:property-placeholder location="classpath:application.properties" 
                                         order="1" 
                                         ignore-unresolvable="true"/>