pmcertificatemgr: add dependency on ca-certificates

Allow connection to secure websites from the VirtualBox environment.

Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@palm.com>

Change-Id: I2efcf80b4dc4ca033ff73c79321c7ff82233357b
Reviewed-on: http://g2g.palm.com/1403
Reviewed-by: Keith Derrick <keith.derrick@palm.com>
Tested-by: Keith Derrick <keith.derrick@palm.com>
Reviewed-by: Build Verification