Rudder

PR https://github.com/Normation/rudder-agent/pull/359

Applied in changeset rudder-agent|dec2673c885c5cd9215618dce3b2d042661dd538.

this does not work with an environement variable. Tested also with empty -p, or no quotes with same failure

# ADMIN_PASSWORD="truc" rudder server create-user -u machin 
Usage:
    htpasswd [-cimBdpsDv] [-C cost] passwordfile username
    htpasswd -b[cmBdpsDv] [-C cost] passwordfile username password

    htpasswd -n[imBdps] [-C cost] username
    htpasswd -nb[mBdps] [-C cost] username password
 -c  Create a new file.
 -n  Don't update file; display results on stdout.
 -b  Use the password from the command line rather than prompting for it.
 -i  Read password from stdin without verification (for script usage).
 -m  Force MD5 encryption of the password (default).
 -B  Force bcrypt encryption of the password (very secure).
 -C  Set the computing time used for the bcrypt algorithm
     (higher is more secure but slower, default: 5, valid: 4 to 31).
 -d  Force CRYPT encryption of the password (8 chars max, insecure).
 -s  Force SHA encryption of the password (insecure).
 -p  Do not encrypt the password (plaintext, insecure).
 -D  Delete the specified user.
 -v  Verify password for the specified user.
On other systems than Windows and NetWare the '-p' flag will probably not work.
The SHA algorithm does not use a salt and is less secure than the MD5 algorithm.