The media_type function is designed to test the following RPC interfaces
with the master server:

RPC LIST 
	show_media_type
	add_media_type
	delete_media_type

ASSUMPTIONS
	The database table is clean or can be cleaned.

STRUCTURE LIST

struct media_tagtype {
        struct media_tagtype *next;
        char *tag;
        char *description;
        long eof_marker;
        longlong_t capacity;
};


STEPS
1) ensure that the database table is empty
2) an empty show_media_type
3) add a tag with out a description
4) add a tag
5) add a tag len 1 description len 1
6) add a tag TAG_MAX -1 STRING_MAX -1
7) add a tag TAG_MAX STRING_MAX
8) add a tag TAG_MAX +1 STRING_MAX +1
9) add a tag len 1 string MAX+1
10 add a null tag
11) delete a null tag
12) delete a tag of len 1
13) delete a nonexistant tag
14) delete a tag of len TAG_MAX-1
15) delete a tag of len TAG_MAX
16) delete a tag of len TAG_MAX+1
17) eof 0 
18) eof MAXINT-1
19) eof MAXINT
20) eof MAXINT+1
21) eof -20
22) capacity -20
23) capacity LONGLONG-1
24) capacity LONGLONG
25) capacity LONGLONG+1
26) capacity 0
26) pad out the rest of the table
18) valid show_media_type

Function/return matrix
			RETURNS 
function
show_media_type		ABS_NO_MATCH(2)
add_media_type		INVALID(3,10)/SUCCESS(4,5,6,7)/RPC ERROR(8,9)
delete_media_type	INVALID(11)/SUCCESS(12,14,15)/NO_MATCH(13)/RPC ERROR(16)