Description of problem:

Setup should check for missing dependencies such as files, DB, Users etc, before the installation starts and not when it is needed, in order to 
1) Save installation time (which is very long: 10-15 mins)
2) Re-install will not need to do cleaning tasks.

for example, missing file caught after >6 !!! minutes.


# rhevm-reports-setup 
Welcome to ovirt-engine-reports setup utility
In order to proceed the installer must stop the ovirt-engine service
Would you like to stop the ovirt-engine service (yes|no): yes
Stopping ovirt-engine...                              [ DONE ]
Editing XML files...                                  [ DONE ]
Setting DB connectivity...                            [ DONE ]
Please choose a password for the reports admin user(s) (rhevm-admin and superuser): 
Warning: Weak Password.
Retype password: 
Warning: Weak Password.
Deploying Server...                                   [ DONE ]
Updating Redirect Servlet...                          [ ERROR ]
[Errno 2] No such file or directory: '/etc/ovirt-engine/engine.conf'

2013-11-05 20:36:09::DEBUG::rhevm-reports-setup::681::root:: /etc/pki/ovirt-engine/keys/engine.p12 exists, ovirt-engine is installed
...
2013-11-05 20:42:32::ERROR::rhevm-reports-setup::1213::root:: Exception caught!


Version-Release number of selected component (if applicable):
is21

How reproducible:
100%

Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info: