Do not prompt me when running `lvresize`.

Noticed that `lvresize` prompts you before executing its command:

``Do you really want to remove active logical volume lv_home? [y/n]:``

This change adds ``-f`` to force the command to run non-interactively.
Merge pull request #17 from omaciel/lvresize-prompt

Do not prompt me when running `lvresize`.
Merge pull request #18 from sthirugn/master

Few enhancements
Pass '-f' to 'lvremove' command.

Passing '-f' to the 'lvremove' command so that it can be run
non-interactively.
Merge pull request #19 from omaciel/lvremove-f

Pass '-f' to 'lvremove' command.
Fix '/etc/fstab' after partitioning.
Use 'iptables' command to configure proxy.

Instead of creating a file with a set of firewall rules, use the
'iptables' command instead.
Merge pull request #20 from omaciel/fix-fstab

Fix '/etc/fstab' after partitioning.
Merge pull request #21 from omaciel/fix-proxy-task

Use 'iptables' command to configure proxy.
Fixes #22: Task to install/remove 'katello-agent'.

Added two new tasks (which can eventually be added to other tasks) to
handle installing and removing the 'katello-agent' package. Fixes issue
Merge pull request #23 from omaciel/issue-22

Fixes #22: Task to install/remove 'katello-agent'.
Add virtual machine management tasks
Added new 'iso_installer' task.

Added new 'iso_installer' task and refactored code that enables RHEL
repositories for Satellite 7 installations.
Merge pull request #24 from omaciel/install-from-iso

Added new 'iso_installer' task.
Better interface parsing for setup_default_capsule

This will ensure to use only one interface when parsing machine's
interfaces on setup_default_capsule task.
Don't setup default capsule for nightly install
Better naming for vm_destroy task arguments
Use 'manage_repos' for nightly builds.

Minor refactoring for the nightly installer and fixed issue where we
were re-assigning `org_name` instead of `loc_name`.
Allows accepting modified (UUID) redhat-manifest

Add a task to setup a fake manifest certificate and restart tomcat.
Fix call to setup_fake_manifest_certificate task

Call setup_fake_manifest_certificate task using execute and passing the
host argument to run on the provisioned machine and not in the
provisioning server.