7042 Improving cleanup_database.pl: handling quotes in a_session and interpreting...

7042 Improving cleanup_database.pl: handling quotes in a_session and interpreting sessdays parameter

Improving the cleanup_database.pl script in two aspects:
1) In some cases CGI::Session seems to place quotes around the atime and ctime
data in the a_session field. Two regexps now take this into account.
2) If the --sessdays parameter is used, the --sessions parameter is now
implicitly enabled too.

With thanks to Ian Bays and Tom Hanstra.

Signed-off-by: Ian Bays <ian.bays@ptfs-europe.com>
Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>