Install gawk

Signed-off-by: Gianpaolo Macario <gmacario@gmail.com>
Update JIRA_INSTALLFILE to v6.3.10

This should fix https://github.com/gmacario/vagrant-atlassian/issues/34

Signed-off-by: Gianpaolo Macario <gmacario@gmail.com>
Update CONFLUENCE_INSTALLFILE to v5.6.4

This should fix https://github.com/gmacario/vagrant-atlassian/issues/33

Signed-off-by: Gianpaolo Macario <gmacario@gmail.com>