Ensure same passwords for same random seeds

Fixes Devskiller#130

src/main/java/com/devskiller/jfairy/producer/person/DefaultPersonProvider.java

@@ -212,8 +212,11 @@ public void generatePassword() {
 		if (password != null) {
 			return;
 		}
-		// FIXME: Replace this with baseProducer
-		password = RandomStringUtils.randomAlphanumeric(8);
+		StringBuilder passwordPattern = new StringBuilder();
+		for (int i = baseProducer.randomBetween(6, 14); i > 0; i--) {
+			passwordPattern.append(baseProducer.randomElement("?", "#"));
+		}
+		password = baseProducer.bothify(passwordPattern.toString());
 	}
 
 	@Override

src/test/groovy/com/devskiller/jfairy/FairySpec.groovy

@@ -74,6 +74,28 @@ class FairySpec extends Specification {
 			!firstPerson.fullName.equals(secondPerson.fullName)
 	}
 
+	def "Second person should have the same password with the same random seed"() {
+		given:
+			Fairy firstFairy = Fairy.builder().withRandomSeed(10).build()
+			Fairy secondFairy = Fairy.builder().withRandomSeed(10).build()
+
+			Person firstPerson = firstFairy.person()
+			Person secondPerson = secondFairy.person()
+		expect:
+			firstPerson.getPassword().equals(secondPerson.getPassword())
+	}
+
+	def "Second person should not have the same password with the different random seeds"() {
+		given:
+			Fairy firstFairy = Fairy.builder().withRandomSeed(10).build()
+			Fairy secondFairy = Fairy.builder().withRandomSeed(20).build()
+
+			Person firstPerson = firstFairy.person()
+			Person secondPerson = secondFairy.person()
+		expect:
+			!firstPerson.getPassword().equals(secondPerson.getPassword())
+	}
+
 	def "should use default DataMaster when custom not provided"() {
 		given:
 			Fairy fairy = Fairy.create();