Improve perf of ConfigurationService and Framework properties retrieval

Java Monitor Blocked
 at java.util.Hashtable.containsKey(Object)
 at org.nuxeo.runtime.services.config.ConfigurationServiceImpl.isBooleanPropertyTrue(String)
 at org.nuxeo.ecm.platform.ui.web.binding.alias.AliasTagHandler.apply(FaceletContext, UIComponent, AliasVariableMapper, FaceletHandler)
 at org.nuxeo.ecm.platform.ui.web.tag.handler.SetTagHandler.apply(FaceletContext, UIComponent)

Java Monitor Blocked
 at java.util.Hashtable.get(Object)
 at org.nuxeo.common.codec.CryptoProperties.getProperty(String, boolean)
 at org.nuxeo.common.codec.CryptoProperties.getProperty(String)
 at org.nuxeo.runtime.osgi.OSGiRuntimeService.getProperty(String, String)
 at org.nuxeo.runtime.api.Framework.getProperty(String, String)
 at org.nuxeo.runtime.api.Framework.getProperty(String)
 at org.nuxeo.runtime.api.Framework.isBooleanPropertyTrue(String)
 at org.nuxeo.runtime.api.Framework.isDevModeSet()
 at org.nuxeo.ecm.platform.forms.layout.service.WebLayoutManagerImpl.getWidget(FaceletContext, LayoutConversionContext, String, String, LayoutDefinition, WidgetDefinition, String, String, String, int)

Java Monitor Blocked
 at java.util.Hashtable.get(Object)
 at org.nuxeo.common.codec.CryptoProperties.getProperty(String, boolean)
 at org.nuxeo.common.codec.CryptoProperties.getProperty(String)
 at org.nuxeo.runtime.osgi.OSGiRuntimeService.getProperty(String, String)
 at org.nuxeo.runtime.api.Framework.getProperty(String, String)
 at org.nuxeo.runtime.api.Framework.getProperty(String)
 at org.nuxeo.runtime.datasource.ConnectionHelper.useSingleConnection(String)
 at org.nuxeo.runtime.datasource.ConnectionHelper.getConnection(String, boolean)