#2756 testsuite - perl warning - Unescaped left brace in regex is deprecated

[Vitezslav Crhonek]

Hello,

Running sblim-cmpi-base testsuite shows perl warning that unescaped left brace in regex is deprecated:

Linux_UnixProcess --- get() started .............................................Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/CIM_ERR_!{ <-- HERE NOT_FOUND}/ at instance.pm line 191, <input_cim> line 14.</input_cim>

Attached patch fixes the issue.