Fix managing runalerts script when HA is enabled.

Make sure that once HA is enabled and hub is NOT working as the active one
runalerts script wont be run. This will eliminate possibility of
having duplicate alert emails from both active and passive hubs.
Add ha_enabled file needed by MP.

In MP first test to figure out if HA is switched on or not is checking
of existence of 'ha_enabled' file. Once HA is enabled file will be created
in directory accessible by httpd to indicate that current hub is working
in HA mode.
Enable use of correct make tool when doing parallel testing.

testall needs the MAKE variable in order to call make recursively.
Merge pull request #321 from pasinskim/ha_bish2

Yet another HA related changes
Clear execute bits from some files that shoulnd't have them set.
Merge pull request #322 from kacfengine/parallel_testall

Enable use of correct make tool when doing parallel testing.
Merge pull request #323 from ediosyncratic/perm-fixes

Clear execute bits from some files that shoulnd't have them set.
Add synchronization of configuration for HA hubs.

Synchronize notification_scripts directory to copy notifications scripts
form active to passive hubs.
DON'T use u_rcp for copying files from one hub to another.
Allow access to needed configuration files for all hubs in HA installation.
Merge pull request #324 from pasinskim/ha_bish2

Add synchronization of configuration for HA hubs.