core: Change audit log value to be unique

There is a duplicate value code in the auditLogType file, which can
cause wrong audit log to be presented.
The proposed patch fix them  it so it will be unique.

Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>
Change-Id: I81e7074807396541d041a170adeff49949b9d731
core: Add audit log for export repo image

Adding an audit log when exporting a repository image (same as
importRepoImage)

Bug-Url: https://bugzilla.redhat.com/1021210
Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>
Change-Id: Ifb79102b01b596a1ff74a1a38fdcb7dca71e0c7c
core: Add missing CDA message to AppErrors[1]

Adding missing CDA error message of export image to the AppErrors file,
so the client will present the message instead of the enum place
holder ACTION_TYPE_FAILED_DISK_IS_BEING_EXPORTED.

Bug-Url: https://bugzilla.redhat.com/1024887
Signed-off-by: Maor Lipchuk <mlipchuk@redhat.com>
Change-Id: I2ca5165d007296778f8a80e07c2e088db82e287f