the sap media structure is different for different sap version - should be unique

[petersatsuse]

as documented in the terraform project, the sap media structure the formula uses need to be different for different sap swpm versions and products.
This is not the case if you use the sap install manual. This confuses customers and make a successful usage of the formula hard.
I would propose a general structure like such below (which other projects use too)

├SWPM_CD
│  ├SWPM20SP07_5-80003424.SAR
│  └SAPCAR_721-20010450.EXE
│  
├EXP_CD
│  ├S4CORE104_INST_EXPORT_1.zip
│  ├S4CORE104_INST_EXPORT_2.zip
│  └...
├DBCLIENT_CD
│  └IMDB_CLIENT20_005_111-80002082.SAR
├BASKET_CD
│   ├SAPHOSTAGENT24_24-20009394.SAR
│   ├igshelper_4-10010245.sar
│   ├igsexe_1-80001746.sar
│   ├SAPEXEDB_400-80000698.SAR^
│   └SAPEXE_400-80000699.SAR
└HANA
    ├51053061_part1.exe
    ├51053061_part2.rar
    ├51053061_part3.rar          
    └51053061_part4.rar

BASKET_ CD : contains SAP kernel, patch + more, like hostagent.
DBCLIENT_CD: contains the package corresponding to DB CLIENT, e.g HANA
EXP_CD : contains the package corresponding to EXPORT files
SWPM_CD : must contain the .exe file corresponding to SAPCAR and the .sar file corresponding to SWPM. The file suffix must be .exe and .sar.