Create directories with permission 0777.

Let umask work its magic. Thanks to "Poil" for reporting this problem.
Fixes GitHub issue #63.
netapp plugin: Close connection on communication errors.
src/utils_avltree.c: Add sanity check to c_avl_destroy().
collection3: Filter out identifiers with control characters.

Otherwise XML errors will prevent the page from rendering.
src/utils_dns.c: Rename the "s_addr" and "d_addr" variables.

On Solaris, there is a macro called "s_addr" resulting in syntax errors
when this is used as a variable name. The variables have been renamed to
circumvent this problem. Thanks to Maciej Bliziński for reporting this
problem and helping to debug it!
src/utils_dns.c: Remove duplicate line.
collection3: Use {instance} in Df's grpah title.

{type_instance} didn't work when used with other plugins than "df", e.g.
the example configuration of the Oracle plugin uses this.
oracle plugin: Report the "connect id" when OCILogon() fails.
oracle plugin: Add database name and query name (if applicable) to error messages.
Fix out-of-bound index in rrdtool.c

Fix a reference to argv[1] that is (always?)
outside the bounds of the argv array. It happens
during a log statement that seems to want
to actually refer to the rrd filename.
Fix for config file parsing ("memcachec plugin: Option `Server' not allowed here.")
collectd.conf(5): Improve description of the configuration syntax.
Fix bad definition of UDP src port in DNS plugin.
src/Makefile.am: Unconditionally link collectd with libm.

Under FreeBSD, running src/utils_format_json.c fails because isfinite()
cannot be resolved. The GNU manpages for isnan() and isfinite() also
advise users to link with libm and AIX has had the library being linked
in for a while. Since it's such a basic library it seems easier to just
link with it unconditionally.

Fixes Github issue #122.
snmp plugin: Check for SNMP_ENDOFMIBVIEW.

Some implementations of SNMP will send a special "variable" when you're
leaving the requested subtree with type "endOfMibView" aka.
"SNMP_ENDOFMIBVIEW". Examples of such implementations are Citrix
Netscalers and IBM's General Parallel File System (GPFS). Reading past
this special variable will result in weird values being returned.

This adds an appropriate check to csnmp_check_res_left_subtree().

Thanks to "Mark" for reporting this issue and clarifying.
df plugin: when checking / do it just once

Newer system symlink /etc/mtab to /proc/mounts which makes root
filesystem seem mounted twice, once as type rootfs and once for the
real device.

When / is selected for df plugin, skip the rootfs mount-point as
real root is usually mounted right on top of it.

Not skipping it causes rrdtool to complain about two updates for the
same timestamp, the first entry for rootfs passes but rrdtool complains
when stats for the second occurrence for real filesystem is being
considered.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Florian Forster <octo@collectd.org>
snmp plugin: Fix error message printed by the "Shift" option.

I noticed a small error in snmp.c in collectd-5.1.0 (might be
elsewhere). The warning message in csnmp_config_add_data_shift says
"Scale config option" instead of "Shift" config option:
[…]

Signed-off-by: Florian Forster <octo@collectd.org>
Merge branch 'collectd-4.10' into collectd-5.0