SLING-3064 - Disable content sync when importing content

Mark imported resources with a session property which prevents the next
update from being performed.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1526713 13f79535-47bb-0310-9956-ffa450edef68
SLING-3129 - Node names which are changed when encoding in platform
format are not imported

Added a test to validate that there is no double-encoding in the
ContentXmlHandler.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1526714 13f79535-47bb-0310-9956-ffa450edef68
SLING-3129 - Node names which are changed when encoding in platform
format are not imported

Removed all path encoding from Jcr commands, since they are expected to
work only on repository paths, not on platform paths.

git-svn-id: https://svn.apache.org/repos/asf/sling/branches/tooling-ide-vlt@1526716 13f79535-47bb-0310-9956-ffa450edef68