Fix Duply/Duplicity backup logging:

Start information added and last backup time recognition fixed.

Start duply v1.5.5.5, time is 2014-10-15 18:31:18.
Using profile '/etc/duply/rear-test'.
Using installed duplicity version 0.6.18, python 2.7.3, gpg 1.4.12 (Home: ~/.gnupg), awk 'GNU Awk 4.0.1', bash '4.2.37(1)-release (x86_64-pc-linux-gnu)'.
Signing disabled. Not GPG_KEY entries in config.
Test - Encryption with passphrase (OK)
Test - Decryption with passphrase (OK)
Test - Compare (OK)
Cleanup - Delete '/tmp/duply.10932.1413397878_*'(OK)

--- Start running command PRE at 18:31:18.583 ---
Running '/etc/duply/rear-test/pre' - OK
Output: kill: usage: kill [-s sigspec | -n signum | -sigspec] pid | jobspec ... or kill -l [sigspec]
--- Finished state OK at 18:31:18.618 - Runtime 00:00:00.035 ---

--- Start running command BKP at 18:31:18.630 ---
Reading globbing filelist /etc/duply/rear-test/exclude
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: none
No signatures found, switching to full backup.
--------------[ Backup Statistics ]--------------
StartTime 1413397878.77 (Wed Oct 15 18:31:18 2014)
EndTime 1413398143.49 (Wed Oct 15 18:35:43 2014)
ElapsedTime 264.72 (4 minutes 24.72 seconds)
SourceFiles 99165
SourceFileSize 1911766153 (1.78 GB)
NewFiles 99165
NewFileSize 1911766153 (1.78 GB)
DeletedFiles 0
ChangedFiles 0
ChangedFileSize 0 (0 bytes)
ChangedDeltaSize 0 (0 bytes)
DeltaEntries 99165
RawDeltaSize 1864277950 (1.74 GB)
TotalDestinationSizeChange 1035585479 (988 MB)
Errors 0
-------------------------------------------------

--- Finished state OK at 18:35:55.435 - Runtime 00:04:36.804 ---

--- Start running command POST at 18:35:55.447 ---
Running '/etc/duply/rear-test/post' - OK
--- Finished state OK at 18:35:55.466 - Runtime 00:00:00.018 ---