Introduce linux-tools/crontab

This module tests the functionality of crontab of the system. Crontab
depends upon the binary run-parts, which is used to run all scripts
under a directory.An entry in the crontab is added by creating an entry
in /etc/crontab.

The module uses the run-parts to execute a script(named cron) created under
/etc/cron.d/ and the script is made to execute every 60 seconds.The script
writes a certain string to a file (/tmp/autotest_cron-<date>).The count of
the string after t seconds decides whether the test succeeded
or not.

The two files used along with run-parts for selective execution of
scripts (jobs.allow and jobs.deny) are also covered under the test.
jobs.allow specifies the scripts to be run and deny specifies scripts
to be ignored.These conditions are also checked.

Signed-off-by: Rajeev S <rajeevs1992@gmail.com>
linux-tools: Testcase for pax archiver

Covers the following functionalities of pax

1. Create archive
2. Extract archive
3. List contents of archive
4. Copy directory structures

Signed-off-by : Rajeev S <rajeevs1992@gmail.com>
Merge pull request #33 from autotest/github-32

Github 32