getBarcode function returns wrong barcode for samples that have the same project name and same limsID but are on different flowcells

```
Dean sequencing
Sample BY_DNA-16
Flowcells: C2KYJACXX,C4VFLACXX

Barcode returned for the Sample BY_DNA-16 on flowcell C4VFLACXX is wrong and in 
fact belongs to the Sample BY_DNA-16 on C2KYJACXX  


```

Original issue reported on code.google.com by `natalia....@gmail.com` on 18 Sep 2014 at 12:03
