Azure: minor changes for filename as strings and logging.

We were passing a unicode string to 'runcmd' in the path to the .crt file.
That is because the keyname was coming from ovf file as unicode.
Ie:
  u'/var/lib/waagent/6BE7A7C3C8A8F4B123CCA5D0C2F1BE4CA7B63ED7.crt'

Then, logging was extending not appending errors.

1 files changed, 2 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 1286e7c1..8029f9af 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -7,6 +7,8 @@
    apt_get_wrapper (LP: #1236531).
  - convert paths provided in config-drive 'files' to string before writing
    (LP: #1260072).
+ - Azure: minor changes in logging output. ensure filenames are strings (not
+   unicode).
 0.7.4:
  - fix issue mounting 'ephemeral0' if ephemeral0 was an alias for a
    partitioned block device with target filesystem on ephemeral0.1.