netget/upsrw: display the type (STRING | NUMBER) beside ENUM and RANGE

[aquette]

Quoting @zykh from #265 :
"Looking quickly at netget.c's get_type() (and the same thing applies to upsrw): if a var is an ENUM or RANGE, then the base type (STRING/NUMERIC) is not printed: RANGE implies NUMERIC so we could directly print it if node->range_list exists, while ENUMs should be splitted between STRING and NUMERIC."

From @aquette:
"true for netget / upsrw: the mod is easy for netget, but requires code refactoring for upsrw. I would be in favor of a separate ticket, for 2.7.5, if you don't mind, not to delay much more 2.7.4 Would it be ok for you"

[aquette]

I'm gonna commit the following (note that NUMBER values are also displayed):

before:

[ambient.temperature.low]
Temperature threshold low (degrees C)
Type: NUMBER

[battery.date]
Battery change date
Type: STRING
Maximum length: 128
Value: Not Set

[test.number]
Description unavailable
Type: ENUM
Option: "1" SELECTED
Option: "2"

[ups.start.auto]
UPS starts when mains is (re)applied
Type: ENUM
Option: "yes" SELECTED
Option: "no"

After:

[ambient.temperature.low]
Temperature threshold low (degrees C)
Type: NUMBER
Value: 0

[battery.date]
Battery change date
Type: STRING
Maximum length: 128
Value: Not Set

[test.number]
Description unavailable
Type: ENUM NUMBER
Option: "1" SELECTED
Option: "2"

[ups.start.auto]
UPS starts when mains is (re)applied
Type: ENUM STRING
Maximum length: 128
Option: "yes" SELECTED
Option: "no"