Default policies from other lightning nodes

This PR add default policies from the main three implementations
but is not finished yet, there is no default value for some values
like `feerate_per_kw_range` on three implementations and
`max_htlc_value_in_flight_msat_min` on lnd, I wrote this on comments

Fix #12

src/channel/bolt/policy.rs

@@ -220,17 +220,69 @@ impl Default for Policy {
 impl Policy {
     /// Sets policy to match default policy used in c-lightning
     pub fn with_clightning_defaults() -> Policy {
-        todo!()
+        Policy {
+            to_self_delay_max: 14 * 24 * 6,
+            // I  don't know what is the normal operational range for c-lightning
+            // but I only see values way more than 100 in examples like this
+            // https://github.com/ElementsProject/lightning/blob/335ef3fb69f923f6f30213f68881d10ee6d977ed/doc/PLUGINS.md#openchannel
+            // or tests like this https://github.com/ElementsProject/lightning/blob/master/tests/test_wallet.py#L594
+            //feerate_per_kw_range: 1..100,
+            minimum_depth: 3,
+            maximum_depth: Some(6),
+            funding_satoshis_min: Some(10000),
+            htlc_minimum_msat_max: None,
+            max_htlc_value_in_flight_msat_min: Some(10000),
+            max_accepted_htlcs_min: Some(30),
+            channel_reserve_satoshis_max_abs: None,
+            // c-lightning uses 10% of the channel funding as a reserve
+            channel_reserve_satoshis_max_percent: Some(10),
+            dust_limit_satoshis_max: Some(546),
+        }
     }
 
     /// Sets policy to match default policy used in LND
     pub fn with_lnd_defaults() -> Policy {
-        todo!()
+        Policy {
+            to_self_delay_max: 14 * 24 * 6,
+            // I am not sure if this is the correct range for LND, even is the correct minimum
+            // I don't find the maximum value
+            // https://github.com/lightningnetwork/lnd/blob/master/lnwallet/chainfee/rates.go#L13
+            // feerate_per_kw_range: 253..?,
+            minimum_depth: 3,
+            maximum_depth: Some(6),
+            funding_satoshis_min: Some(20000),
+            htlc_minimum_msat_max: None,
+            // Can't find the maximum value for this
+            // max_htlc_value_in_flight_msat_min: Some(10000),
+            max_accepted_htlcs_min: Some(483),
+            channel_reserve_satoshis_max_abs: None,
+            // LND uses 1% of the channel funding as a reserve
+            channel_reserve_satoshis_max_percent: Some(1),
+            // Since LND 0.13.3 there is no default value for dust limit
+            // DustLimitForSize retrieves the dust limit for a given pkscript size
+            // 546 is the biggest value for p2pkh
+            // https://github.com/lightningnetwork/lnd/pull/5781
+            dust_limit_satoshis_max: Some(546),
+        }
     }
 
     /// Sets policy to match default policy used in Eclair
     pub fn with_eclair_defaults() -> Policy {
-        todo!()
+        Policy {
+            to_self_delay_max: 14 * 24 * 6,
+            // Same doubts as with LND and c-lightning about feerate_per_kw_range
+            //feerate_per_kw_range: 1..100,
+            minimum_depth: 3,
+            maximum_depth: Some(6),
+            funding_satoshis_min: Some(100000),
+            htlc_minimum_msat_max: None,
+            max_htlc_value_in_flight_msat_min: Some(5000000000),
+            max_accepted_htlcs_min: Some(30),
+            channel_reserve_satoshis_max_abs: None,
+            // LND uses 5% of the channel funding as a reserve
+            channel_reserve_satoshis_max_percent: Some(5),
+            dust_limit_satoshis_max: Some(546),
+        }
     }
 
     fn validate_peer_params(