lamassu-install and lamassu-update bugfixes (#261)

* Call bip39 after lamassu-server gets installed

* Fix bash variable declaration

* Remove mnemonic path from migrate defaults

This caused the update-to-mnemonic script to skip thinking the mnemonic
already existed

lamassu-default.json

@@ -1,6 +1,5 @@
 {
   "seedPath": "/etc/lamassu/seeds/seed.txt",
-  "mnemonicPath": "/etc/lamassu/mnemonics/mnemonic.txt",
   "caPath": "/etc/ssl/certs/Lamassu_OP_Root_CA.pem",
   "certPath": "/etc/ssl/certs/Lamassu_OP.pem",
   "keyPath": "/etc/ssl/private/Lamassu_OP.key",

lamassu-remote-install/install

@@ -92,12 +92,6 @@ apt update >> $LOG_FILE 2>&1
 decho "Installing necessary packages..."
 apt install nodejs python-minimal build-essential supervisor postgresql libpq-dev -y -q >> $LOG_FILE 2>&1
 
-decho "Generating mnemonic..."
-mkdir -p $MNEMONIC_DIR >> $LOG_FILE 2>&1
-SEED=$(openssl rand -hex 32)
-MNEMONIC=$(bip39 $SEED)
-echo "$MNEMONIC" > $MNEMONIC_FILE
-
 decho "Installing latest npm package manager for node..."
 retry 3 npm -g --unsafe-perm install npm@5  >> $LOG_FILE 2>&1
 NODE_MODULES=$(npm -g root)
@@ -106,6 +100,12 @@ NPM_BIN=$(npm -g bin)
 decho "Installing lamassu-server..."
 retry 3 npm -g --unsafe-perm install lamassu/lamassu-server#${1-master} >> $LOG_FILE 2>&1
 
+decho "Generating mnemonic..."
+mkdir -p $MNEMONIC_DIR >> $LOG_FILE 2>&1
+SEED=$(openssl rand -hex 32)
+MNEMONIC=$(bip39 $SEED)
+echo "$MNEMONIC" > $MNEMONIC_FILE
+
 decho "Creating postgres user..."
 POSTGRES_PW=$(hkdf postgres-pw $SEED)
 su -l postgres >> $LOG_FILE 2>&1 <<EOF

package.json

@@ -74,6 +74,7 @@
     "lamassu-admin-server": "./bin/lamassu-admin-server",
     "lamassu-apply-defaults": "./bin/lamassu-apply-defaults",
     "hkdf": "./bin/hkdf",
+    "bip39": "./bin/bip39",
     "lamassu-backup-pg": "./bin/lamassu-backup-pg",
     "lamassu-mnemonic": "./bin/lamassu-mnemonic",
     "lamassu-cancel": "./bin/lamassu-cancel",