Implement sysutil_check_name_string, Fix process default sdk version

[elad335]

• Default sdk version is -1. (SYS_PROCESS_PARAM was not set)
• Implement sysutil_check_name_string:
  • Only limited set of characters is allowed in parameters of a few sysutil functions (\ or / for example aren't allowed, thus the need to escape from / no longer needed there).
  • It turns out if sdk version is below 3.70 it is allowed to insert another character at the end of buffer length, must be proceeded by a null terminator. (e.g for cellSysCacheMount this null term is found at getCachePath[0].)

[Nekotekina]

I see. I don't think that exposing syscache_info internals is necessary. exitspawn could just save and restore /dev_hdd1/ mount location. syscache_info constructor could detect it too.

[elad335]

can't detect if mounted or not in exitspawn without access to syscache_info::init.

[elad335]

Removed exitspawn commit, also updated syscache testcase to include
extra char at end of cacheId test for older sdk version (redefined CELL_SDK_VERSION).

This fails on 4.75 with (↓) on mounting 32 chars long id (33 with null term):

cellSysCacheMount(error 0x8002bc03)
cache path=, id=16-45-01-83-01000000000000000000

For default sdk version test refer to commit elad335/myps3tests@67eae92 .

[Megamouse]

Is that the string check we talked about. If yes then it might be used in that other place I don't remember