All packages have the following description: "An object/document-oriented database"

We need to have different descriptions for each of these packages that represent what is actually being installed. Now that we have separate packages we don't need to repeat what MongoDB is and instead describe what the package actually contains.

Also we should probably update the description to be: "A cross-platform document-oriented database server".

Consider the following:

• mongodb-org - MongoDB cross-platform document-oriented database system (metapackage)
• mongodb-org-mongos - MongoDB sharding router binary
• mongodb-org-server - MongoDB database server binary
• mongodb-org-shell - MongoDB shell client binary
• mongodb-org-tools - MongoDB tool binaries

This is what mysql does:

• mysql-client - MySQL database client (metapackage depending on the latest version)
• mysql-client-5.5 - MySQL database client binaries
• mysql-server - MySQL database server (metapackage depending on the latest version)
• mysql-server-5.5 - MySQL database server binaries and system database setup
• mysql-common - MySQL database common files, e.g. /etc/mysql/my.cnf