### Description
I tried to use the `$env(NAME)` pseudovariable as argument for `modparam()` calls but
evidently the result was empty.
### Troubleshooting
#### Reproduction
Set up `auth_ephemeral` and add this to your configuration:
```
modparam("auth_ephemeral", "secret",
"$env(AUTH_EPHEMERAL_SECRET)")
```
Now export `AUTH_EPHEMERAL_SECRET=something` and start Kamailio with sufficient debug
output. You'll see that Kamailio literally uses `$env(AUTH_EPHEMERAL_SECRET)` as
secret instead of inserting the value of the environment variable.
#### Log Messages
```
kamailio_1 | 17(23) DEBUG: auth_ephemeral [authorize.c:136]: do_auth(): secret:
$env(AUTH_EPHEMERAL_SECRET) (27)
```
### Possible Solutions
Replacement of environment variables should be supported in `modparams()`. (And possibly
in *all* functions.)
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.2.1 (x86_64/linux)
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC,
DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER,
USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144 MAX_URI_SIZE 1024, BUF_SIZE 65535,
DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 5.3.1
```
* **Operating System**:
```
$ uname -a
Linux e2193249aa45 4.4.0-128-generic #154-Ubuntu SMP Fri May 25 14:15:18 UTC 2018 x86_64
x86_64 x86_64 GNU/Linux
```
(Using the Docker image `kamailio/kamailio:5.2.1-xenial` ATM.)
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