gitignore: Ignore all log files

Before this change, only *.log and *.log.[0-9] patterns were
ignored, which was not enough. Examples of file names which were
not ignored:

    devstack.log.2018-08-09-100547
    wget-log
    wget-log.1

Patterns *.log.* and *-log.* work for every log file generated by
devstack.

Change-Id: I6f0de5de74f196ab9df66cf3f2f969e53da01c22
Signed-off-by: Michal Rostecki <mrostecki@suse.de>

Author: vadorovsky

.gitignore

@@ -1,7 +1,9 @@
 *~
 .*.sw?
 *.log
-*.log.[1-9]
+*-log
+*.log.*
+*-log.*
 *.pem
 *.pyc
 .localrc.auto