Some cacti single-item graphs are broken due to cacti hexadecimal transformation

[Roman Vynar]

At least the following graphs are broken:
- Mysql Innodb Semaphore Waits;
- Mysql Innodb Semaphore Wait Time;
- Mysql Innobd Lock Structures;
and some more but it depends.

Cacti poller has a bug which checks a single-item output for hexadecimal number.

For example, Mysql Innodb Semaphore Waits graph uses the following script output:
ke:0

And it is usually zero. What poller.php does:

php > include('/usr/share/cacti/lib/functions.php');
php > $value = 'ke:0';
php > if (is_hexadecimal($value)) { echo 'yes'; }
yesphp >

Then it converts "ke:0" into decimal 224 (0xE0). Thus this graph's default value is 224 instead of 0.
The same with Mysql Innodb Semaphore Wait Time graph: kf:0 -> 240 (0xF0).
We can see these numbers on the graphs.

And all other graphs that use a single-item variable name matching /[a-fA-F0-9]/ i.e. ke, kf, j1 etc. with the output value equals to zero or something small.

To fix the issue it might be worth to rename all XY output variables for both ss_get_mysql_stats.php and ss_get_by_ssh.php scripts avoiding /[a-fA-F0-9]/ i.e.:
gg
gh
...
gz
hg
hh
...
hz
ig
...
...
zz

(26-6)^2=400 combinations - pretty enough as up to 200 are in use.