Added security checks for symlinks

Added security checks which prevents service from interacting with
symlinks. It is not possible to list/delete/read/write to symlinks.

Tested:
Added unit tests wh

Added security checks for symlinks

Added security checks which prevents service from interacting with
symlinks. It is not possible to list/delete/read/write to symlinks.

Tested:
Added unit tests which confirm that:
- Symlinks cannot be removed
- Symlinks are not listed
- Symlinks cannot be overwritten
- Symlinks cannot be read

Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
Change-Id: I50d6d10dac81fd454e7e30520a7c47d5146be58c

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Implement Report persistency

Now Report properties are stored in non-volatile memory. It allows
to restore Report after system restart. Persistency of a report is
controlled by Persistency property

Implement Report persistency

Now Report properties are stored in non-volatile memory. It allows
to restore Report after system restart. Persistency of a report is
controlled by Persistency property in Report interface.

Tested:
- Passed unit tests
- Verified that report is stored in /var/lib/telemetry dir
- Verified that report is restored from storage after telemetry
service start

Signed-off-by: Wludzik, Jozef <jozef.wludzik@intel.com>
Change-Id: Iccfe21603eecffc4e174a4403f699b03de320db9

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Added PersistentJsonStorageClass

PersistentJsonStorage is used to store persistent information in
json format. This class will be used by ReportManager to save
persistent report configuration.

Test

Added PersistentJsonStorageClass

PersistentJsonStorage is used to store persistent information in
json format. This class will be used by ReportManager to save
persistent report configuration.

Tested:
- Added unit tests for new functionality
- All other unit tests are passing

Signed-off-by: Krzysztof Grobelny <krzysztof.grobelny@intel.com>
Change-Id: Ib496e6782e849d910fe37c02c355047afda5c79c

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