Add a word boundary \b to the regexp for checking the output of a2{en,dis}mod,
to avoid a false positive for a module that ends with the same text as the
module we're working on.
For example, the previous regexp r'.*spam already enabled' would also match
against 'eggs_spam already enabled'.
Also, get rid of the redundant '.*' from the end of the regexp.
This small change corrects behavior when one uses an .rsync-filter file to exclude some paths from both being transferred and being deleted, so that these excluded paths can be handled separately with different tasks (e.g. in order to deploy the excluded paths independently from the rest paths and notify handlers appropriately). The problem with the double -FF option is that it excludes the .rsync-filter file from being transferred to the receiver. However, deletions are done on the side of the receiver, so it is absolutely necessary the .rsync-filter file to be transferred to the receiver, so that the receiver knows what files to delete and what not to delete.
The problem was introduced in commit f5789e8e. 'tenancy' is a parameter of
ec2.run_instances, but not in ec2.request_spot_instances. So it was breaking
the support for spot requests.
This option allows the module to ensure that ONLY the specified keys
exist in the authorized_keys file. All others will be removed. This is
quite useful when rotating keys and ensuring no other key will be
accepted.
As stated in #423, the commit 7f11c3d broke ec2 spot instance launching
after 1.7.2. This is because it acts on the 'res' variable which have 2
different types in the method, and in case we request spot instances,
the resulting object is not a result of ec2.run_instances() but
ec2.request_spot_instances(). Actually this fix doesn't seem to be
relevant in the spot instances case, because by construction we won't
retrieve 'terminated' instances in the end.
