Fix tests/ccram to use POSIX string equality operator
Fix tests/ccram to use POSIX string equality operator

This patch updates tests/ccram to compare strings using `=`, which is
POSIX sh compliant.

ifduyue/libcork,HappyYang/varon-t,redjack/libcork,redjack/libcork,redjack/ipset,tempbottle/varon-t,tempbottle/libcork,ifduyue/libcork,tempbottle/libcork,rogers0/libcork,rogers0/libcork,HappyYang/varon-t,dcreager/libcork,tempbottle/libcork,tempbottle/libcork,HappyYang/varon-t,tempbottle/varon-t,dcreager/libcork,redjack/libcork,tempbottle/libcork,dcreager/fleet,ifduyue/libcork,dcreager/fleet,tempbottle/varon-t,johnzachary/varon-t,dcreager/libcork,rogers0/libcork,ifduyue/libcork,ifduyue/libcork,dcreager/fleet,rogers0/libcork,redjack/ipset,HappyYang/varon-t,rogers0/libcork,dcreager/libcork,tempbottle/libcork,redjack/ipset,redjack/libcork,tempbottle/varon-t,ifduyue/libcork,johnzachary/varon-t,johnzachary/varon-t,rogers0/libcork,redjack/libcork,dcreager/libcork,redjack/libcork,johnzachary/varon-t