Run [pre|post]_msm.d scripts

These scripts allow notifying programs using files in mass storage
directories before mass storage is mounted or unmounted.

Open-webOS-DCO-1.0-Signed-off-by: Timo Aarnipuro <timo.aarnipuro@palm.com>
Open-webOS-DCO-1.0-Signed-off-by: Janne Kiiski <janne.kiiski@palm.com>

Change-Id: I25ce03052f036ea05a07e77b559e78e3a7e90a5e
Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@palm.com>
Reviewed-on: http://g2g.palm.com/1509
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <keith.derrick@palm.com>
Tested-by: Keith Derrick <keith.derrick@palm.com>