[sr-dev] [kamailio/kamailio] Cannot use environment variables in modparam() function (#2276)

[Mathias Brodala]

I finally got around to test this but it seems I'm doing something wrong:

```
#!substdef "/DBRWUSER/$env(DBRWUSER)/g"
#!substdef "/DBRWPW/$env(DBRWPW)/g"
#!substdef "/DBHOST/$env(DBHOST)/g"
#!substdef "/DBNAME/$env(DBNAME)/g"

#!define DBURL "mysql://DBRWUSER:DBRWPW@DBHOST/DBNAME"
```

Now trying to start Kamailio (5.3.3 as suggested) fails:

```
kamailio_1  |  0(1) ERROR: <core> [core/pvapi.c:923]: pv_parse_spec2(): error searching pvar "env"
kamailio_1  |  0(1) ERROR: <core> [core/pvapi.c:1126]: pv_parse_spec2(): wrong char [D/68] in [$env(DBRWUSER)/g] at [5 (5)]
kamailio_1  |  0(1) ERROR: <core> [core/re.c:170]: parse_repl(): bad specifier in replace part /$env(DBRWUSER)/g
kamailio_1  |  0(1) ERROR: <core> [core/ppcfg.c:69]: pp_subst_add(): bad subst expression: /DBRWUSER/$env(DBRWUSER)/g
kamailio_1  |  0(1) ERROR: <core> [core/ppcfg.c:96]: pp_substdef_add(): subst rule cannot be added
```

I also tried the following but it doesn't make a difference:

```
#!substdef "!DBURL!mysql://$env(DBRWUSER):$env(DBRWPW)@$env(DBHOST)/$env(DBNAME)!"
```

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