net: move gitno buffer to staticstr

The `gitno` buffer interface is another layer on top of socket reads.
Abstract it a bit into a "static string" that has `git_str` like
semantics but without heap allocation which moves the actual reading
logic into the socket / stream code, and allows for easier future usage
of a static / stack-allocated `git_str`-like interface.

Author: ethomson

src/libgit2/fetch.c

@@ -17,7 +17,6 @@
 #include "remote.h"
 #include "refspec.h"
 #include "pack.h"
-#include "netops.h"
 #include "repository.h"
 #include "refs.h"
 #include "transports/smart.h"

src/libgit2/fetch.h

@@ -11,8 +11,6 @@
 
 #include "git2/remote.h"
 
-#include "netops.h"
-
 int git_fetch_negotiate(git_remote *remote, const git_fetch_options *opts);
 
 int git_fetch_download_pack(git_remote *remote);

src/libgit2/netops.c

@@ -11,7 +11,6 @@
 #include "zstream.h"
 #include "delta.h"
 #include "iterator.h"
-#include "netops.h"
 #include "pack.h"
 #include "thread.h"
 #include "tree.h"

src/libgit2/netops.h

@@ -13,7 +13,6 @@
 #include "str.h"
 #include "hash.h"
 #include "oidmap.h"
-#include "netops.h"
 #include "zstream.h"
 #include "pool.h"
 #include "indexer.h"

src/libgit2/pack-objects.c

@@ -14,7 +14,6 @@
 #include "runtime.h"
 #include "stream.h"
 #include "streams/socket.h"
-#include "netops.h"
 #include "git2/transport.h"
 #include "util.h"
 

src/libgit2/pack-objects.h

@@ -20,7 +20,6 @@
 #include "stream.h"
 #include "net.h"
 #include "streams/socket.h"
-#include "netops.h"
 #include "git2/transport.h"
 #include "git2/sys/openssl.h"
 
@@ -71,14 +70,14 @@ static void *git_openssl_malloc(size_t bytes, const char *file, int line)
 	GIT_UNUSED(line);
 	return git__calloc(1, bytes);
 }
- 
+
 static void *git_openssl_realloc(void *mem, size_t size, const char *file, int line)
 {
 	GIT_UNUSED(file);
 	GIT_UNUSED(line);
 	return git__realloc(mem, size);
 }
- 
+
 static void git_openssl_free(void *mem, const char *file, int line)
 {
 	GIT_UNUSED(file);

src/libgit2/streams/mbedtls.c

@@ -8,7 +8,6 @@
 #include "streams/socket.h"
 
 #include "posix.h"
-#include "netops.h"
 #include "registry.h"
 #include "runtime.h"
 #include "stream.h"

src/libgit2/streams/openssl.c

@@ -9,7 +9,7 @@
 
 #include "common.h"
 
-#include "netops.h"
+#include "stream.h"
 
 typedef struct {
 	git_stream parent;