Update indexes after adding security repo in MapR plugin

The root cause of the bug is that repo with necessary
package exists but indexes are not updated so the package
is not available.

Closes-Bug: #1498479
Change-Id: I38a0291e391057d8111ea304e4d00ad0c194e2e2

sahara/plugins/mapr/domain/service.py

@@ -89,8 +89,7 @@ class Service(object):
             cmd = cluster_context.distro.create_install_cmd(packages)
             with instance.remote() as r:
                 r.execute_command(cmd, run_as_root=True,
-                                  timeout=_INSTALL_PACKAGES_TIMEOUT,
-                                  raise_when_error=False)
+                                  timeout=_INSTALL_PACKAGES_TIMEOUT)
 
     def _get_packages(self, node_processes):
         result = []

sahara/plugins/mapr/resources/add_security_repos.sh

@@ -4,3 +4,4 @@ cat >> /etc/apt/sources.list.d/security_repo.list << EOF
 deb http://security.ubuntu.com/ubuntu precise-security main
 deb http://security.ubuntu.com/ubuntu lucid-security main
 EOF
+apt-get update