storagecommands: Split validation logic

The Fru validation logic is useful in isolation, split it into a
separate library that can be included.

Tested:
[0/1] Running all tests.
1/12 phosphor-objmg

storagecommands: Split validation logic

The Fru validation logic is useful in isolation, split it into a
separate library that can be included.

Tested:
[0/1] Running all tests.
1/12 phosphor-objmgr / well_known OK 0.24s
2/12 phosphor-objmgr / need_to_introspect OK 0.22s
3/12 phosphor-objmgr / name_change OK 0.16s
4/12 phosphor-objmgr / interfaces_added OK 0.13s
5/12 phosphor-objmgr / handler OK 0.09s
6/12 phosphor-objmgr / mapper OK 0.07s
7/12 phosphor-host-ipmid / entitymap_json OK 0.06s
8/12 phosphor-host-ipmid / message OK 0.05s
9/12 phosphor-host-ipmid / session/closesession OK 0.03s
10/12 phosphor-objmgr / associations OK 0.20s
11/12 phosphor-host-ipmid / dbus-sdr/sensorcommands OK 0.02s
12/12 intel-ipmi-oem / message OK 0.02s

Ok: 12
Expected Fail: 0
Fail: 0
Unexpected Pass: 0
Skipped: 0
Timeout: 0

Change-Id: I9130eb81703b0cda7c3229f16cd689dd2c96c55c
Signed-off-by: Peter Foley <pefoley@google.com>

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