Merge pull request #545 from reshmabidikar/tomcat9-upgrade

Update for Tomcat 9

userguide/getting-started/includes/tomcat.adoc

@@ -1,13 +1,13 @@
-Users familiar with Java technologies can also install Kill Bill and Kaui directly in the Web container of their choice. We recommend using Tomcat version 8.5. This section covers the instructions for installing Kill Bill and Kaui in Tomcat. If this approach is followed, you will also need to configure the database manually as explained below.
+Users familiar with Java technologies can also install Kill Bill and Kaui directly in the Web container of their choice. We recommend using Tomcat version 9.0.x. This section covers the instructions for installing Kill Bill and Kaui in Tomcat. If this approach is followed, you will also need to configure the database manually as explained below.
 
 === Tomcat Installation and configuration
 
 The first step in installing Kill Bill in Tomcat is to download and install Tomcat. For this, you need to follow the steps given below:
 
-. Download the Core binary distribution of the Tomcat container from http://tomcat.apache.org/download-80.cgi[here] 
-(At the time of writing, *8.5.59* is the latest version, however it can change in the future as newer versions are released.) The downloaded zip file contains a folder called *apache-tomcat-8.5.59*
+. Download the Core binary distribution of the Tomcat container from https://tomcat.apache.org/download-90.cgi[here]
+(At the time of writing, *9.0.84* is the latest version, however it can change in the future as newer versions are released.) The downloaded zip file contains a folder called *apache-tomcat-9.0.84*
 
-. Extract *apache-tomcat-8.5.59* and place it on any location on your computer. This path will be refered to as *TOMCAT_HOME* from now on. (For example, if you place *apache-tomcat-8.5.59* in a directory called ```C:\Software```, *TOMCAT_HOME* refers to ```C:\Software\apache-tomcat-8.5.59```). It should look like this:
+. Extract *apache-tomcat-9.0.84* and place it on any location on your computer. This path will be refered to as *TOMCAT_HOME* from now on. (For example, if you place *apache-tomcat-9.0.84* in a directory called ```C:\Software```, *TOMCAT_HOME* refers to ```C:\Software\apache-tomcat-9.0.84```). It should look like this:
 [source,yaml]
  $TOMCAT_HOME
      --bin