Fix luarocks installation functionality

Found that default wget on alpine 3.9 is not workable with luarocks
tool. Package with wget and git tools need to be additionaly
installed there. Also for alpine 3.5 git tool need to be installed
with repository update before it.

Closes #170

Author: avtikhon

dockerfiles/alpine_3.5_1.x

@@ -224,6 +224,10 @@ RUN set -x \
     && : "---------- remove build deps ----------" \
     && apk del .build-deps
 
+# gh-170: needed for luarocks
+RUN apk update && \
+    apk add wget git
+
 RUN mkdir -p /var/lib/tarantool \
     && chown tarantool:tarantool /var/lib/tarantool \
     && mkdir -p /opt/tarantool \

dockerfiles/alpine_3.5_2.x

@@ -228,6 +228,10 @@ RUN set -x \
     && : "---------- remove build deps ----------" \
     && apk del .build-deps
 
+# gh-170: needed for luarocks
+RUN apk update && \
+    apk add wget git
+
 RUN mkdir -p /var/lib/tarantool \
     && chown tarantool:tarantool /var/lib/tarantool \
     && mkdir -p /opt/tarantool \

dockerfiles/alpine_3.9_1.x

@@ -216,6 +216,9 @@ RUN set -x \
     && : "---------- remove build deps ----------" \
     && apk del .build-deps
 
+# gh-170: needed for luarocks
+RUN apk add wget git
+
 RUN mkdir -p /var/lib/tarantool \
     && chown tarantool:tarantool /var/lib/tarantool \
     && mkdir -p /opt/tarantool \

dockerfiles/alpine_3.9_2.x

@@ -219,6 +219,9 @@ RUN set -x \
     && : "---------- remove build deps ----------" \
     && apk del .build-deps
 
+# gh-170: needed for luarocks
+RUN apk add wget git
+
 RUN mkdir -p /var/lib/tarantool \
     && chown tarantool:tarantool /var/lib/tarantool \
     && mkdir -p /opt/tarantool \