CLOUDSTACK-1066: Fix only one postinstall script, install packages etc.

- Remove different scripts, just use postinstall.sh that runs after basic appliance
  is built using veewee
- Port package installation method from old script
- Time the installation/build process

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
Summary: Fix path so the right files are removed from the install dir
Summary: changed the path from cloud to cloudstack.

The change in package script allowed us to create proper tar under rpmbuild/SOURCES directory

The change in the path enabled us to launch the management server properly.

Signed-off-by: Hugo Trippaers <htrippaers@schubergphilis.com>
Committed-by: Hugo Trippaers <htrippaers@schubergphilis.com>
CLOUDSTACK-1175: Fix NPE by making _store a static variable shared by objects

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>