FAB-8365 update baseimage version to 0.4.6
FAB-8365 update baseimage version to 0.4.6

This patch will update the baseimage version to 0.4.6.

It supports the below changes:
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FAB-8264 upgrade nodejs version to v8.9.4
[FAB-7884] direct couchdb logs to stderr
[FAB-7707] Disable time-based kafka log retention.
[FAB-7868] Upgrade Kafka to version 1.0.0
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Change-Id: I0c8946997fa48f8cc26ee6aaef480fd896c35ae5
Signed-off-by: rameshthoomu <1e6b86b1c013461e7a60f449583642b87c2b3c3b@gmail.com>

saadk10/fabric-ca,saadk10/fabric-ca