Remove nearestCity from node configuration. (#721)

* Fix bug in demobench. Explorer didn't show correctly location of a node.
There was no nearestCity override in config.

* Remove nearestCity from node configuration. Now information about the location is always taken from
node's legal name. If not present - exception on node startup.

* Add X500Name.locationOrNull that soft fails when location is not in X500 name. Address PR comments.

* Remove unused imports.

docs/source/example-code/build.gradle

@@ -73,7 +73,6 @@ task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['jar']) {
     networkMap "CN=Notary Service,O=R3,OU=corda,L=London,C=UK"
     node {
         name "CN=Notary Service,O=R3,OU=corda,L=London,C=UK"
-        nearestCity "London"
         advertisedServices = ["corda.notary.validating"]
         p2pPort 10002
         rpcPort 10003
@@ -82,7 +81,6 @@ task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['jar']) {
     }
     node {
         name "CN=Alice Corp,O=Alice Corp,L=London,C=UK"
-        nearestCity "London"
         advertisedServices = []
         p2pPort 10005
         rpcPort 10006

docs/source/example-code/src/main/resources/example-network-map-node.conf

@@ -1,5 +1,4 @@
 myLegalName : "CN=Notary Service,O=R3,OU=corda,L=London,C=UK"
-nearestCity : "London"
 keyStorePassword : "cordacadevpass"
 trustStorePassword : "trustpass"
 p2pAddress : "my-network-map:10000"

docs/source/example-code/src/main/resources/example-node.conf

@@ -1,5 +1,4 @@
 myLegalName : "CN=Bank A,O=Bank A,L=London,C=UK"
-nearestCity : "London"
 keyStorePassword : "cordacadevpass"
 trustStorePassword : "trustpass"
 dataSourceProperties : {

docs/source/example-code/src/main/resources/example-out-of-process-verifier-node.conf

@@ -1,5 +1,4 @@
 myLegalName : "CN=Bank A,O=Bank A,L=London,C=UK"
-nearestCity : "London"
 p2pAddress : "my-corda-node:10002"
 webAddress : "localhost:10003"
 networkMapService : {