Change in pysim[master]: Use zero padding for EF['ACC'] field

[Robert Falkenberg]

Hello Jenkins Builder, laforge, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/c/pysim/+/23632

to look at the new patch set (#4).

Change subject: Use zero padding for EF['ACC'] field
......................................................................

Use zero padding for EF['ACC'] field

The ``EF_ACC`` field defines the access control class (ACC)
for a subscriber.

Without this patch, the implementation adds padding 1 towards
the most significant bits if the input is shorter than 2 bytes.

However, it should be padded with 0, otherwise additional ACCs
are allocated to the subscriber. (Probably only a single bit
shall be set to 1)

Excerpt from [ETSI TS 131 102, 4.2.15](https://www.etsi.org/deliver/etsi_ts/131100_131199/131102/04.15.00_60/ts_131102v041500p.pdf):

```
EF_ACC: Two bytes: B1, B2

B1.b8...B1.b4: high priority users (class 15...11)
B1.b3: always 0
B1.b2...B1.b2 and B2.b7...B2.b0: normal priority users (class 9...0) - to be evenly distributed across subscribers
```

**Legend:** Byte X, bit Y: BX.bY


Change-Id: Ie9040c6b127c268878a0845ed73d0918ec6bbb08
---
M pySim/cards.py
1 file changed, 1 insertion(+), 1 deletion(-)


  git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/32/23632/4
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Gerrit-Project: pysim
Gerrit-Branch: master
Gerrit-Change-Id: Ie9040c6b127c268878a0845ed73d0918ec6bbb08
Gerrit-Change-Number: 23632
Gerrit-PatchSet: 4
Gerrit-Owner: Robert Falkenberg <robert.falkenberg at tu-dortmund.de>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-MessageType: newpatchset
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