Check the correct email address when generating a gpg key

src/freedombone-utils-gpg

     echo $'Generating a new GPG key'
     su -m root -c "gpg --homedir /home/$key_username/.gnupg --batch --full-gen-key /home/$key_username/gpg-genkey.conf" - $key_username
     chown -R $key_username:$key_username /home/$key_username/.gnupg
-    KEY_EXISTS=$(gpg_key_exists "$key_username" "${key_username}@${HOSTNAME}")
+    KEY_EXISTS=$(gpg_key_exists "$key_username" "$MY_EMAIL_ADDRESS")
     if [[ $KEY_EXISTS == "no" ]]; then
-        echo $"A GPG key for ${key_username}@${HOSTNAME} could not be created"
+        echo $"A GPG key for $MY_EMAIL_ADDRESS could not be created"
         exit 63621
     fi
     shred -zu /home/$key_username/gpg-genkey.conf
-    CURR_GPG_PUBLIC_KEY_ID=$(gpg_pubkey_from_email "$key_username" "${key_username}@${HOSTNAME}")
+    CURR_GPG_PUBLIC_KEY_ID=$(gpg_pubkey_from_email "$key_username" "$MY_EMAIL_ADDRESS")
     if [ ${#CURR_GPG_PUBLIC_KEY_ID} -lt 4 ]; then
-        echo $"GPG public key ID could not be obtained for ${key_username}@${HOSTNAME}"
+        echo $"GPG public key ID could not be obtained for $MY_EMAIL_ADDRESS"
         exit 825292
     fi
     gpg_set_permissions $key_username