Resolves compatible with PB size storage file and Linux CentOS 7 commands including iscsiadm, parted, fdisk, mkfs.*

[ActiveVolcano]

1. Fix redundant one block capacity

After login jSCSI target via the Linux bundled iSCSI initiator command iscsiadm,
fdisk -l reports capacity with one redundant block (512 bytes), e.g.

Disk /dev/sdd: 10000.0 GB, 10000000000512 bytes, 19531250001 sectors

and jSCSI logs error messages about read / write address out of range.
All of above are caused by jSCSI target returning wrong capacity value.

This pull request fix it,
and also fix #8 for the same cause.

2. Add Unit Serial Number page into INQUIRY command

After login jSCSI target via the Linux bundled iSCSI initiator command iscsiadm,
jSCSI logs error messages about illegal INQUIRY request like

ERROR o.j.t.connection.stage.fullfeature.InquiryStage - illegal INQUIRY request
ERROR o.j.t.connection.stage.fullfeature.InquiryStage - CDB bytes:
0x12   0x01   0x80   0x00
0xfe   0x00   0x00   0x00
0x00   0x00   0x00   0x00
0x00   0x00   0x00   0x00

which is an Unit Serial Number page INQUIRY request,
added support by this pull request.

3. Support PB size storage file as target

This pull request adds iSCSI commands READ (16), READ (12), WRITE (16), WRITE (12) to jSCSI target module,
so that PB size file can be used as storage.
It works under Linux CentOS 7 with the bundled commands iscsiadm, parted, fdisk, mkfs.*

4. Support Linux parted command

Linux CentOS 7 bundled command parted aborts with error
because lack of REPORT SUPPORTED OPERATION CODES in jSCSI target,
which is fixed by this pull request.

5. Enrich README

• How to build
• Markdown head format compatible with GitHub