### 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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