Merge opentimestamps#34: Default min interval and systemd init script

6b188e3 adding systemd script to manage otsd (Riccardo Casatta)
12bf477 change default value for --btc-min-tx-interval from 10 minutes to 1 hour (Riccardo Casatta)

Pull request description:

Tree-SHA512: e05dffa0b02eed079da0a77cc98748e1d4f03fa113befe28bb4216cf34e4ab03d25f9b4708ae3187a5f29a7e3418b5f3f3c82c7fbb73de41e7ddf7af02830290

Author: petertodd

contrib/systemd/bitcoind-ready.sh

@@ -0,0 +1,5 @@
+#/bin/bash
+until /usr/local/bin/bitcoin-cli getblockchaininfo
+do
+  /bin/sleep 3
+done

contrib/systemd/otsd.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=OpenTimestamps server
+After=bitcoind.service
+
+[Service]
+User=ots
+Group=ots
+ExecStartPre=/bin/bash /usr/local/bin/bitcoind-ready.sh
+ExecStart=/home/ots/opentimestamps-server/otsd -v
+Restart=on-failure
+
+KillSignal=SIGINT
+
+[Install]
+WantedBy=multi-user.target

otsd

@@ -63,7 +63,7 @@ parser.add_argument("--btc-min-confirmations", metavar='N', type=int,
                     default=6,
                     help="Confirmations required before we save a Bitcoin timestamp permanently, must be greater than 1 (default: %(default)d)")
 parser.add_argument("--btc-min-tx-interval", metavar='SECONDS', type=int,
-                    default=600,
+                    default=3600,
                     help="Minimum interval between timestamp transactions (default: %(default)d seconds)")
 parser.add_argument("--btc-max-fee", metavar='FEE', type=float,
                     default=0.001,