.cache folder is not created during first run

[fdosani]

This might not be a bug but just hoping to confirm.

Recreated with the following steps:

• I'm running on a freshly installed macbook as an FYI.
• Installed cloud-custodian
• I signed up for a new AWS account
• setup credentials via IAM user/role
• Ran an off hours policy on a empty account (which should return nothing)

I got the following error:

(cloud-custodian)➜  cc_policy custodian run --dryrun -c test.yaml -s out
2016-04-23 11:59:07,529: custodian.output:INFO Storing output with <DirectoryOutput to dir:out/offhour-stop-19>
2016-04-23 11:59:07,529: custodian.policy:INFO Running policy offhour-stop-19
2016-04-23 11:59:07,530: custodian.resources.ec2:INFO Querying ec2 instances with []
2016-04-23 11:59:08,414: custodian.output:ERROR Error while executing policy
Traceback (most recent call last):
  File "/Users/faisal/Documents/git/cloud-custodian/c7n/policy.py", line 169, in poll
    resources = self.resource_manager.resources()
  File "/Users/faisal/Documents/git/cloud-custodian/c7n/resources/ec2.py", line 79, in resources
    self._cache.save(qf, instances)
  File "/Users/faisal/Documents/git/cloud-custodian/c7n/cache.py", line 79, in save
    with open(self.cache_path, 'w') as fh:
IOError: [Errno 2] No such file or directory: '/Users/faisal/.cache/cloud-custodian.cache'
2016-04-23 11:59:08,415: custodian.commands:WARNING Error while executing policy offhour-stop-19, continuing
2016-04-23 11:59:08,415: custodian.output:INFO Storing output with <DirectoryOutput to dir:out/onhour-start-10>
2016-04-23 11:59:08,415: custodian.policy:INFO Running policy onhour-start-10
2016-04-23 11:59:08,415: custodian.resources.ec2:INFO Querying ec2 instances with []
2016-04-23 11:59:08,757: custodian.output:ERROR Error while executing policy
Traceback (most recent call last):
  File "/Users/faisal/Documents/git/cloud-custodian/c7n/policy.py", line 169, in poll
    resources = self.resource_manager.resources()
  File "/Users/faisal/Documents/git/cloud-custodian/c7n/resources/ec2.py", line 79, in resources
    self._cache.save(qf, instances)
  File "/Users/faisal/Documents/git/cloud-custodian/c7n/cache.py", line 79, in save
    with open(self.cache_path, 'w') as fh:
IOError: [Errno 2] No such file or directory: '/Users/faisal/.cache/cloud-custodian.cache'
2016-04-23 11:59:08,760: custodian.commands:WARNING Error while executing policy onhour-start-10, continuing

I'm wondering if the .cache folder should be generated as part of the process if it doesn't already exist? The fix was easy in that I just did a mkdir ~/.cache. Might just make things more friendly?

[kapilt]

thanks!, closed in #23