tests: Add unit tests for cgroup_compare_wildcard_procname()

 tests: Add unit tests for cgroup_compare_wildcard_procname()

This commit adds unit tests for cgroup_compare_wildcard_procname().

The following tests are included in this commit:

WildcardProcnameSimpleMatch - Compares an ignore rule with a
    wildcarded procname with a matching procname.  Expects true.

WildcardProcnameNoMatch - Compares an ignore rule with a wildcarded
    procname with a process that has a non-matching name.  Expects
    false.

ProcnameWildcard_AsteriskNoMatch - Compares a wildcard rule with
    a process name that doesn't match.  Expects false.

ProcnameWildcard_AsteriskMatch - Compares a wildcard rule with
    a process name that does match the rule.  Expects true.

ProcnameWildcard_AsteriskNoMatch2 - Compares a wildcard rule
    with a process name that is shorter than the rule and thus
    does not match.  Expects false.

ProcnameWildcard_AsteriskMatchExactly - Compares a wildcard
    rule with a process name that matches the rule exactly.
    Expects true.

ProcnameWildcard_NoAsteriskMatchExactly - Compares a rule
    with no wildcards with a process name that exactly matches
    the rule.  Expects false as the function exits early due
    to no asterisk in the rule.

The results from googletest are reported below:

[----------] 13 tests from CgroupCompareIgnoreRuleTest
<snip>
[ RUN      ] CgroupCompareIgnoreRuleTest.WildcardProcnameSimpleMatch
[       OK ] CgroupCompareIgnoreRuleTest.WildcardProcnameSimpleMatch (0 ms)
[ RUN      ] CgroupCompareIgnoreRuleTest.WildcardProcnameNoMatch
[       OK ] CgroupCompareIgnoreRuleTest.WildcardProcnameNoMatch (0 ms)
[----------] 13 tests from CgroupCompareIgnoreRuleTest (1 ms total)

[----------] 7 tests from ProcnameWildcardTest
[ RUN      ] ProcnameWildcardTest.ProcnameWildcard_NoAsterisk
[       OK ] ProcnameWildcardTest.ProcnameWildcard_NoAsterisk (0 ms)
[ RUN      ] ProcnameWildcardTest.ProcnameWildcard_AsteriskNoMatch
[       OK ] ProcnameWildcardTest.ProcnameWildcard_AsteriskNoMatch (0 ms)
[ RUN      ] ProcnameWildcardTest.ProcnameWildcard_AsteriskMatch
[       OK ] ProcnameWildcardTest.ProcnameWildcard_AsteriskMatch (0 ms)
[ RUN      ] ProcnameWildcardTest.ProcnameWildcard_AsteriskNoMatch2
[       OK ] ProcnameWildcardTest.ProcnameWildcard_AsteriskNoMatch2 (0 ms)
[ RUN      ] ProcnameWildcardTest.ProcnameWildcard_AsteriskMatchExactly
[       OK ] ProcnameWildcardTest.ProcnameWildcard_AsteriskMatchExactly (0 ms)
[ RUN      ] ProcnameWildcardTest.ProcnameWildcard_NoAsteriskMatchExactly
[       OK ] ProcnameWildcardTest.ProcnameWildcard_NoAsteriskMatchExactly (0 ms)
[ RUN      ] ProcnameWildcardTest.ProcnameWildcard_AsteriskFirstChar
[       OK ] ProcnameWildcardTest.ProcnameWildcard_AsteriskFirstChar (0 ms)
[----------] 7 tests from ProcnameWildcardTest (0 ms total)

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>