Updated alpine builder image to 4.6.0 in examples

Updated alpine builder image to the latest version 4.6.0 which uses the
latest RMR release (4.9.0).

Issue-Id: RIC-986
Signed-off-by: Abhijit Gadgil <gabhijit@iitbombay.org>
Change-Id: Icb30b588e00926886c0a06bec05461ceaedea300
2 files changed