resolve: rename "systemd-resolve-host" tool to simply "systemd-resolve"

The tool resolves way more than just hosts, hence give it a more generic name. This should be safe, as the tool is
currently undocumented. Before we add documentation for it, let's get the name right.

This also moves the C source into src/resolve/ (from src/resolve-host/), since the old name is a misnomer now. Also,
since it links directly to many of the C files of resolved it really belongs into resolved's directory anyway.

.gitignore

@@ -109,7 +109,7 @@
 /systemd-remount-api-vfs
 /systemd-remount-fs
 /systemd-reply-password
-/systemd-resolve-host
+/systemd-resolve
 /systemd-resolved
 /systemd-rfkill
 /systemd-run

Makefile.am

@@ -5267,8 +5267,8 @@ libnss_resolve_la_LIBADD = \
 lib_LTLIBRARIES += \
 	libnss_resolve.la
 
-systemd_resolve_host_SOURCES = \
-	src/resolve-host/resolve-host.c \
+systemd_resolve_SOURCES = \
+	src/resolve/resolve-tool.c \
 	src/resolve/resolved-dns-packet.c \
 	src/resolve/resolved-dns-packet.h \
 	src/resolve/resolved-dns-rr.c \
@@ -5280,15 +5280,15 @@ systemd_resolve_host_SOURCES = \
 	src/resolve/dns-type.c \
 	src/resolve/dns-type.h
 
-nodist_systemd_resolve_host_SOURCES = \
+nodist_systemd_resolve_SOURCES = \
 	src/resolve/dns_type-from-name.h \
 	src/resolve/dns_type-to-name.h
 
-systemd_resolve_host_LDADD = \
+systemd_resolve_LDADD = \
 	libshared.la
 
 rootlibexec_PROGRAMS += \
-	systemd-resolve-host
+	systemd-resolve
 
 tests += \
 	test-dns-domain \

src/resolve-host/Makefile

@@ -1 +0,0 @@
-../Makefile